Debra Messing vs. Blake Shelton, Arsenio Hall vs. Sinead O'Connor, Hulk Hogan vs. Gawker Media, Kanye West vs. Amber Rose, the "Blurred Lines" copyright case and more: Reminding us that celebrities don't always play nicely.

Rob Kardashian vs. Blac Chyna

After reality TV star Blac Chyna sent former
After reality TV star Blac Chyna sent former fiance Rob Kardashian a video of her in bed with another man over the July 4, 2017, weekend, Kardashian lashed out by posting explicit photos of Chyna on Instagram, as well as accusing her of infidelity, promiscuity and drug use. She responded on Snapchat with a claim that Kardashian had beaten her, and by getting a restraining order against him. (Credit: Getty Images)

Chris Brown vs. Soulja Boy

The trouble between singer Chris Brown and rapper
The trouble between singer Chris Brown and rapper Soulja Boy began in January 2017 when Soulja Boy left a smiley face emoji under an Instagram photo of Brown's ex-girlfriend Karrueche Tran. Soulja Boy tweeted that night that Brown threatened to fight him for liking the photo. Several more nasty posts followed. Ultimately, both hip-hop stars announced that they've signed on for a three-round pay-per-view bout that will take place in March in Las Vegas. (Credit: Getty Images for H&M / Michael Kovac; AP)

Azealia Banks vs. Rihanna

Rapper Azealia Banks launched a social media beef
Rapper Azealia Banks launched a social media beef against Rihanna in response to President Donald Trump's order to temporarily suspend immigration from seven predominantly Muslim nations. Banks called out the Barbados-born Rihanna on Jan. 28, 2017, after the singer tweeted: "Disgusted! The news is devastating! America is being ruined right before our eyes!" People magazine reports Banks responded by noting that Rihanna isn't a citizen and can't vote. Banks added, "Stop chastising the president." (Credit: Getty Images)

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Dwayne "The Rock" Johnson vs. Vin Diesel

Dwayne Johnson and Vin Diesel are reportedly at
Dwayne Johnson and Vin Diesel are reportedly at odds after Johnson's rant about unprofessionalism on the set of "Fast 8." In a Facebook post on Monday, Aug. 1, 2016, "The Rock" wrote: "Some [male co-stars] conduct themselves as stand up men and true professionals, while others don't. The ones that don't are too chicken [expletive] to do anything about it anyway. Candy [expletive]. When you watch this movie next April and it seems like I'm not acting in some of these scenes and my blood is legit boiling -- you're right." Diesel appeared to have responded, cryptically, to Johnson's claims in a new Instagram video, in which he ultimately states "I will tell you everything." (Credit: AFP, Getty Images / Angela Weiss)

Kanye West vs. Jay-Z

Kanye West ended his Sacramento, Calif., show after
Kanye West ended his Sacramento, Calif., show after just four songs back in November 2016, but not before a 10-minute tirade that included Jay-Z and Beyoncé. During his rant, West had expressed grievances about Jay-Z, telling the crowd that he did not visit him in person after his wife, reality TV star Kim Kardashian, was robbed at gunpoint in Paris. By July 2017, news broke that West, one of the founding co-owners of Tidal, reportedly left that music-streaming service in a contract dispute over money. Jay-Z reportedly fired back with the track "Kill Jay Z" on album "4:44," which appears to reference West unflatteringly. (Credit: Getty Images )

Debra Messing vs. Blake Shelton

Actress and outspoken Democrat Debra Messing and country
Actress and outspoken Democrat Debra Messing and country singer and "The Voice" judge Blake Shelton got into a politically charged spat over the presidential election after comments that Shelton made when he said that Donald Trump "says what he thinks, and he has proven that you don't always have to be so afraid." Messing later tweeted Shelton's girlfriend, Gwen Stefani, saying, "please talk to your man to not vote for the person who will STRIP you of your rights." After Shelton denied on Twitter that he was backing Trump, Messing deleted her Tweet and apologized. Shelton replied, "Thank you sis. I don't endorse anybody. For this very reason!!" (Credit: AP)

Kim Kardashian vs. Taylor Swift

Kim Kardashian stirred the pot between Taylor Swift
Kim Kardashian stirred the pot between Taylor Swift and Kanye West on Sunday, July 17, 2016, when on Snapchat, she posted video of a phone call between the rapper and pop superstar about his song "Famous," in which he rapped: "I feel like me and Taylor might still have sex. Why? I made that [expletive] famous." This is another attempt by Kardashian to prove Swift knew all along of the lyrics, even though the "Shake It Off" singer continues to deny it. (Credit: Getty Images / Andreas Rentz)

Sinead O'Connor vs. Arsenio Hall

Comedian Arsenio Hall filed a $5 million libel
Comedian Arsenio Hall filed a $5 million libel lawsuit against singer Sinead O'Connor on May 5, 2016, after O'Connor posted a Facebook status accusing Hall of furnishing singer Prince with drugs. Prince died Thursday, April 21, 2016. Hall ultimately dismissed the lawsuit. (Credit: AP / Antonio Calanni, Richard Shotwell)

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Wiz Khalifa vs. Kanye West

Kanye West and Wiz Khalifa set the Twitterverse
Kanye West and Wiz Khalifa set the Twitterverse ablaze in January 2016, as they beefed over West's abrupt decision to change his album's title from "Swish" to "Waves." Wiz believed that the "Waves" concept belongs to rapper Max B and asked, "Please don't take the wave." Things soon escalated over what West perceived as a dig at his wife Kim Kardashian. West went off on the "See You Again" rapper, his relationship with West's ex, Amber Rose, and their child. However, Wiz claimed the comment was simply a reference to smoking weed. A few days later, West tweeted "Me and Wiz spoke yesterday. Great convo. All positive." (Credit: Getty Images)

Marion "Suge" Knight vs. Chris Brown

Former hip-hop mogul Marion
Former hip-hop mogul Marion "Suge" Knight sued singer Chris Brown and a Los Angeles nightclub in 2016 over a 2014 shooting in which Knight was injured and required surgery. The lawsuit, filed in Los Angeles Superior Court, accuses Brown, who hosted the party, and the nightclub 1 OAK LA of having inadequate security that allowed at least one armed person to enter. The suit argues that special security precautions should have been taken because of Brown's "well-documented track record of hosting events and/or parties in which violence frequently erupted." (Credit: Getty Images)

Madonna vs. Guy Ritchie

A legal dispute between queen of pop Madonna
A legal dispute between queen of pop Madonna and her filmmaker ex-husband Guy Ritchie, concerning their son, Rocco, ensued because Madonna wanted her son to return to her custody in the United States. Their monthslong custody battle was resolved in September 2016. (Credit: Getty Images )

Hulk Hogan vs. Gawker Media

A Florida jury sided with ex-pro wrestler Hulk
A Florida jury sided with ex-pro wrestler Hulk Hogan and awarded him $115 million in his sex tape lawsuit against Gawker Media, on Friday, March 18, 2016. Hogan, whose given name is Terry Bollea, sued the gossip-news website for $100 million for posting a video in 2012 of him having sex with his former best friend's wife. (Credit: The Tampa Bay Times via AP / Eve Edelheit; AP / Steve Nesius, Pool)

50 Cent vs. Vivica A. Fox

When Vivica A. Fox appeared on
When Vivica A. Fox appeared on "Watch What Happens Live" in November 2015, she suggested ex-boyfriend rapper 50 Cent is gay. Prior to her appearance on the show, 50 had dissed the hit TV show "Empire," on which Fox appears, so naturally, host Andy Cohen had to ask: "What were your thoughts when 50 Cent blamed the season ratings dip on 'gay stuff'?" Fox responded, "You know, the pot calling the kettle black is all I'm saying." 50 Cent responded with "Oh No!!! Now she things [sic] I'm gay because I let her [expletive]. LMAO. Wait, I didn't want her to, she forced me, my hands were tied. 50 Shades of Grey." (Credit: Getty Images)

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Giuliana Rancic vs. Zendaya

During an episode of E!'s
During an episode of E!'s "Fashion Police," Giuliana Rancic said actress Zendaya's dreadlocks on the 87th annual Academy Awards red carpet suggested the smell of "patchouli oil or weed." Following a social-media backlash for saying that, Rancic tweeted, "Dear Zendaya, I'm sorry I offended you and others. I was referring to a bohemian chic look. Had NOTHING to do with race and NEVER would!!!" The Disney Channel star then posted a lengthy message on Instagram, saying in part, "There is a fine line between what is funny and disrespectful. Someone said something about my hair at the Oscars that left me in awe . . . because I was hit with ignorant slurs and pure disrespect. To say that an 18 year old woman with locs must smell of patchouli oil or 'weed' is not only a large stereotype but outrageously offensive." (Credit: Getty Images)

Miley Cyrus v. Nicki Minaj

Before the 2015 MTV Video Music Awards, Miley
Before the 2015 MTV Video Music Awards, Miley Cyrus told the New York Times Nicki Minaj was "not too kind" and "not very polite" after Minaj became upset "Anaconda" wasn't nominated for Video of the Year. "If I was a different 'kind' of artist, 'Anaconda' would be nominated for best choreo and vid of the year as well," Minaj tweeted, which Cyrus told the Times she felt that meant "white and blonde" artists were the only ones nominated. During Minaj's acceptance speech for hip-hop video of the year at the 2015 show, she called out host Cyrus for the comments she made about the rapper in the paper. Minaj referred to Cyrus as "this [expletive] that had a lot of stuff to say about me in the press. Miley, what's good?" Cyrus seemed stunned, but congratulated Minaj on the win and said her New York Times quotes were "manipulated." (Credit: Getty Images)

Sean Penn vs. Lee Daniels

Oscar winner Sean Penn sued filmmaker and
Oscar winner Sean Penn sued filmmaker and "Empire" co-creator Lee Daniels for defamation. Penn filed the $10 million suit in September 2015, alleging Daniels' statements in an interview with The Hollywood Reporter compared him with "Empire" star Terrence Howard. Howard is the target of numerous complaints and two arrests stemming from accusations of hitting women. (Credit: AP / Joel Ryan (left), Paul A. Hebert)

Robin Thicke and Pharrell Williams vs. Marvin Gaye's family

On March 10, 2015, a federal jury in
On March 10, 2015, a federal jury in Los Angeles ruled that singer Robin Thicke, far right, and producer Pharrell Williams, center, had committed copyright infringement by copying elements of Marvin Gaye's 1977 hit "Got to Give It Up," to create their 2013 chart-topping single "Blurred Lines." Gaye's family had sued Thicke and Pharrell, and was awarded a walloping $7.4 million by the jury. (Credit: AP / Getty Images)

Orlando Bloom vs. Justin Bieber

Actor Orlando Bloom was captured on video in
Actor Orlando Bloom was captured on video in July 2014 throwing a punch at pop star Justin Bieber during a heated confrontation in a restaurant in Spain. TMZ.com posted an apparent cellphone video showing the "Lord of the Rings" star at a crowded Cipriani in Ibiza, lashing his arm out at Bieber as others separate the duo. It was unclear if the punch made contact. The website cited witnesses offering conflicting versions of the encounter, with one claiming Bieber made a rude comment about Bloom's ex-wife, supermodel Miranda Kerr, and another saying Bieber extended his hand to the actor, who rebuffed it, prompting a Bieber remark followed by the thrown punch. (Credit: AP, Getty Images)

Solange vs. Jay-Z

Singer Solange Knowles, younger sister of music star
Singer Solange Knowles, younger sister of music star Beyoncé, and Jay-Z got into a scuffle on May 5, 2014, in an elevator at Manhattan's Standard Hotel after the Metropolitan Museum Gala. TMZ posted a three-minute video that showed Solange pummeling her brother-in-law and continuing to kick him after being pulled away. Shortly after, the trio released a statement saying in part that "our family has worked through it. Jay and Solange each assume their share of responsibility for what has occurred. They both acknowledge their role in this private matter that has played out in the public. They both have apologized to each other and we have moved forward as a united family." Jay-Z also acknowledged the incident on his album "4:44," released Friday, June 30, 2017, by accepting the blame for his sister-in-law's physical attack on him. (Credit: AP; Getty Images )

Perez Hilton vs. Lady Gaga

Former BFFs Perez Hilton and Lady Gaga had
Former BFFs Perez Hilton and Lady Gaga had a falling out when the superstar did "an interview for him to support a show he was doing and in the middle of the interview he started asking me really terrible questions and he was being very negative about 'Born This Way' . . . And he was supposed to be my friend and I felt betrayed, so I started crying," Gaga recalled on Howard Stern's radio show in November 2013. Hilton responded with tweets saying, "I was the one who pulled away from you after I realized what a real-life vampire you are!" and telling Stern, "Reach out to me if you want me to come in and speak the truth about Lady Gaga!" (Credit: AP; Getty Images)

Sinead O'Connor vs. Miley Cyrus

On Oct. 3, 2013, Miley Cyrus lashed out
On Oct. 3, 2013, Miley Cyrus lashed out at the "Nothing Compares 2 U" singer on Twitter, posting photos of O'Connor's not-so-fine moments (including desperate tweets for psychiatric help following her suicide attempt in January 2012) after O'Connor wrote an "open letter" to Cyrus on her website, saying she is "extremely concerned" for the 20-year-old. (Credit: AP (2))

Jimmy Kimmel vs. Kanye West

After a Sept. 24, 2013,
After a Sept. 24, 2013, "Jimmy Kimmel Live" skit poking fun at Kanye West, the rapper called the comedian to tell him his life would be "much better" if Kimmel made a public apology, and referred to himself as the most powerful voice in media, Kimmel revealed during his monologue two days later. West went on an expletive-filled Twitter rant targeting Kimmel soon after the phone call. "Finally, I'm in a rap feud," the comedian said on his show. (Credit: AP; Getty Images)

Katie Couric vs. Kim Kardashian

Katie Couric told inTouch magazine in August 2013,
Katie Couric told inTouch magazine in August 2013, "I don't understand -- why are they so famous? I think it's mostly teenage girls that are interested," when referring to the Kardashians. Kim Kardashian responded by posting a photo on Instagram of a baby gift Couric sent her, with the hashtag "#IHateFakeMediaFriends." (Credit: Getty Images; AP)

Sylvester Stallone vs. Bruce Willis

In tweets announcing
In tweets announcing "Expendables" star Bruce Willis will not return for the franchise's third installment, "Expendables 3," Sylvester Stallone called Willis "greedy and lazy." On Aug. 6, 2013, Stallone, who co-wrote the first two "Expendables" films, posted, "WILLIS OUT... HARRISON FORD IN!!!! GREAT NEWS!!!!! Been waiting years for this!!!!" followed by "GREEDY AND LAZY... A SURE FORMULA FOR CAREER FAILURE." Stallone's rep confirmed the tweets were referring to Willis, but did not elaborate. (Credit: Getty Images (2))

Selma Blair vs. Charlie Sheen

TMZ reported in June 2013 that Selma Blair
TMZ reported in June 2013 that Selma Blair had complained to the "Anger Management's" producers about Charlie Sheen's lack of professionalism, and when word filtered back to Sheen, whose Estevez/Sheen Productions is a partner in the show, he demanded the actress be fired. Blair, who played Sheen's love interest, did not return to the show. (Credit: AP; Getty Images)

Drake vs. Chris Brown

Drake and Chris Brown were partying in the
Drake and Chris Brown were partying in the VIP section at Club W.I.P. on June 14, 2012, when Drake began taunting Brown about his ex-girlfriend Rihanna, according to multiple media reports. The exchanging of words about singer Rihanna, who both have a romantic history with, led to both posses clashing, including bottles thrown, which left Brown with a bloody gash on his chin. (Credit: AP; Getty Images)

Kelly Osbourne vs. Christina Aguilera

Kelly Osbourne and Christina Aguilera's feud goes back
Kelly Osbourne and Christina Aguilera's feud goes back to 2011 when Osbourne called Aguilera fat on E!'s "Fashion Police." While critiquing her appearance, she said, "She called me fat for years. I said, '[expletive] you, now you're fat, too! ... Now you know how it feels!" (Credit: Getty Images)

Jon Hamm vs. Kim Kardashian

"Mad Men" star Jon Hamm put down reality TV star Kim Kardashian in a 2012 interview with Elle UK by saying, "stupidity is certainly celebrated." Kardashian called Hamm's comments "careless." (Credit: Getty Images)

Charlie Sheen vs. Chuck Lorre

After Charlie Sheen was fired from TV's
After Charlie Sheen was fired from TV's "Two and a Half Men" for all the negative headlines he made in 2011, he verbally attacked producer Chuck Lorre, calling him a "turd," among other things. Eventually, Sheen filed a lawsuit against the Long Islander and Warner Bros. (Credit: Left: Getty Images, Right: AP)

Ciara vs. Rihanna

During an episode of E!'s
During an episode of E!'s "Fashion Police" in February 2011, Ciara said Rihanna "wasn't the nicest," prompting the "We Found Love" singer to tweet "My bad ci, did I 4get to tip u?" (Credit: Getty Images)

Chelsea Handler vs. Angelina Jolie

Chelsea Handler, the notoriously outspoken E! late-night host
Chelsea Handler, the notoriously outspoken E! late-night host went on what seemed like a verbal rampage against A-lister Angelina Jolie during a raucous stand-up performance on her "Chelsea Chelsea Bang Bang" tour in Newark in 2010. "I hate her, too, I hate that [expletive], she's a homewrecker, she is," Handler said of Jolie, referencing the Jolie-Brad Pitt-Jennifer Aniston love triangle. The comic went on to say she believes Jolie is not a nice person, among some vulgar statements. Once news broke that Pitt and Jolie were divorcing, Handler ripped back into Jolie, saying: "There are rumors that part of the problem was that Brad was allegedly drinking and smoking too much weed," she said. "I wonder why he would need to self-medicate? Maybe because he could have been spending the last 12 years at Lake Como hanging out with George Clooney and Matt Damon instead of being stuck in a house with 85 kids speaking 15 different languages. Oh yeah, because he married a [expletive] lunatic, that's why." (Credit: Getty Images; EPA / Mak Remissa)

Kanye West vs. Taylor Swift

Kanye West interrupted Taylor Swift's acceptance speech at
Kanye West interrupted Taylor Swift's acceptance speech at the 2009 Video Music Awards to say that Beyoncé should have won the award instead. The following year, Swift performed a new song, "You're Still an Innocent," to mock the rapper. In a separate feud, Swift got upset with West over his February release of "Famous," which includes the lyrics: "I feel like me and Taylor might still have sex. Why? I made that [expletive] famous." (Credit: Getty Images)

Megan Fox vs. Michael Bay

During a 2009 Wonderland magazine interview, Megan Fox
During a 2009 Wonderland magazine interview, Megan Fox was asked what working with Michael Bay was like to which she answered, "He's like Napoleon and he wants to create this insane, infamous mad man reputation. He wants to be like Hitler on his sets, and he is. So he's a nightmare to work for but when you get him away from set, and he's not in director mode, I kind of really enjoy his personality because he's so awkward, so hopelessly awkward. He has no social skills at all." The two, who worked together on the "Transformers" film franchise, then parted ways, but a few years later, squashed their beef when Fox was hired to play April O'Neil in 2014's "Teenage Mutant Ninja Turtles." (Credit: Getty Images)

Lil' Kim vs. Nicki Minaj

The feud between rappers Lil' Kim and Nicki
The feud between rappers Lil' Kim and Nicki Minaj began in 2007 when Lil' Kim accused Minaj of copying her persona. Both women continue to take shots at each other through their music. In Minaj's song "Roman's Revenge," she calls Lil' Kim a "has been." Lil' Kim fired back with the song "Black Friday," saying, "You're garbage so I'm taking out the trash." (Credit: Getty Images)

Heather Locklear vs. Denise Richards

Heather Locklear and Denise Richards ended their friendship
Heather Locklear and Denise Richards ended their friendship in 2006, when Richards began dating Bon Jovi guitarist Richie Sambora, to whom Locklear was married to for 11 years. (Credit: Getty Images)

Paris Hilton vs. Nicole Richie

Once best friends and
Once best friends and "Simple Life" co-stars, Paris Hilton and Nicole Richie ended their longtime friendship in the early to mid 2000s for reasons neither would reveal, but Hilton says, "Nicole knows what she did, and that's all I'm ever going to say about it." (Credit: AP)

Tom Cruise vs. Brooke Shields

Tom Cruise criticized Brooke Shields for taking antidepressants
Tom Cruise criticized Brooke Shields for taking antidepressants to deal with postpartum depression after giving birth to her first child in 2005. Shields retaliated with an op-ed piece in the New York Times. Cruise eventually apologized. (Credit: AP; ©Patrick McMullan / Sean Zanni)

Elton John vs. Madonna

Elton John has lobbed insults at former friend
Elton John has lobbed insults at former friend Madonna many times since their feud ignited in 2004 when he said during a Q Award acceptance speech, "Madonna, best live act? [Expletive] off. Since when has lip-syncing been live? Sorry about that, but I think everyone who lip-syncs on stage in public when you pay like 75 quid to see them should be shot. Thank you very much. That's me off her Christmas card list, but do I give a toss? No." Fastforward to 2012, and the British singer still feels the same way. "Madonna looks like a fairground stripper," he said. (Credit: AP)

Mariah Carey vs. Eminem

After meeting in 2001 to discuss a possible
After meeting in 2001 to discuss a possible collaboration on Mariah Carey's "Charmbracelet" album, a fling reportedly started between Carey and Eminem, something the Long Island native has always denied. The two have gone back and forth for years, with Eminem releasing "Bagpipes from Baghdad" and Carey "Obsessed." (Credit: Getty Images )

Shannen Doherty vs. Alyssa Milano

Former co-stars Alyssa Milano and Shannen Doherty's feud
Former co-stars Alyssa Milano and Shannen Doherty's feud began on "Charmed" in 2001. It was reported that Doherty was jealous of Milano. Eventually, Doherty left the show. (Credit: Getty Images)

Axl Rose vs. Slash

Despite being members of Guns N' Roses, it
Despite being members of Guns N' Roses, it is no secret that Axl Rose and Slash do not get along. A feud between the two ignited in 1991 when Slash announced he'd be working with Michael Jackson. Five years later, he quit the band. (Credit: Left: AP, Right:Getty Images)