These celebrities are well-known for having embraced a vegetarian or vegan lifestyle.

Derek Hough

Derek Hough (
Derek Hough ("Dancing with the Stars") told Us Weekly while at the Choreography Nominee Reception in Los Angeles on Sunday, Aug. 27, that he and his girlfriend, Hayley Erbert, are "both trying the vegan thing right now and it's actually really easy. People are like, 'Is it hard?' and I'm like, 'nah.' Living in LA, it's actually hard not to be [vegan]. I feel great. I have a lots of energy, my skin has cleared up, I feel great." (Credit: Getty Images)

Joan Jett

In 2013, Long Beach's Joan Jett and her
In 2013, Long Beach's Joan Jett and her band were booted off the South Dakota tourism float at the Macy's Thanksgiving Day parade after ranchers complained about having a vegetarian and animal rights advocate representing their state, according to NYDailyNews.com. (Credit: Aaron Zebrook)

Mayim Bialik

A longtime vegan, in 2014 Mayim Bialik authored
A longtime vegan, in 2014 Mayim Bialik authored a cookbook titled, "Mayim's Vegan Table." (Credit: Getty Images / Jason Merritt)

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Alan Cumming

Alan Cumming, the Scottish-born Broadway and television star
Alan Cumming, the Scottish-born Broadway and television star ("The Good Wife") participated in a 2016 outreach campaign promoting veganism for PETA during gay-pride events across the United States. (Credit: Invision / Jordan Strauss)

RZA

Actor-director and Wu-Tang Clan rapper RZA, who says
Actor-director and Wu-Tang Clan rapper RZA, who says he first became a vegetarian in 1995, has been a longtime vegan who participated in an ad campaign for PETA, asking fans to follow in his footsteps, according to VeganGoodLife.com. (Credit: Getty Images / Kevin Winter)

Ne-Yo

Ne-Yo said his 2013 New Year's resolution was
Ne-Yo said his 2013 New Year's resolution was to give up meat and dairy, according to PETA. (Credit: Getty Images)

Lea Michele

Actress Lea Michele says she fluctuates between being
Actress Lea Michele says she fluctuates between being a vegan and a vegetarian. "I really feel that you need to kind of listen to your body and what your body is telling you to eat. So I was a vegan for about two years," she once told Shape magazine. (Credit: AP)

Alicia Silverstone

Growing up, actress and
Growing up, actress and "The Kind Diet" vegan cookbook author Alicia Silverstone "flirted with vegetarianism," according to Oprah.com, but it wasn't until she became an adult that she changed her diet from "steaks and doughnuts" to a healthier, vegan one. (Credit: Getty Images / Jamie McCarthy)

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Betty White

Former
Former "Golden Girl" Betty White is an animal activist and a vegan, according to ET Online. (Credit: Getty Images)

Russell Simmons

Hip-hop mogul Russell Simmons sat down with
Hip-hop mogul Russell Simmons sat down with "Today's" Al Roker, during which he confessed how he became a vegan: "Well, it started with my yoga practice and, you know, the practice of non-harming, "ahimsa," so I became a vegan because [of] compassion [for] the animals." Simmons has been leading a vegan lifestyle for nearly 18 years, he said. (Credit: Getty Images)

Jessica Chastain

"I used to think about dieting, but I'm vegan now, so it's not really a problem," actress Jessica Chastain once said, according to Harper's Bazaar. (Credit: AP)

Brad Pitt

According to The Daily Mail, actor Brad Pitt
According to The Daily Mail, actor Brad Pitt "has been a vegetarian for decades." (Credit: Getty Images / Jamie McCarthy)

Carrie Underwood

Country singer Carrie Underwood became a vegetarian after
Country singer Carrie Underwood became a vegetarian after seeing her parents "castrate calves," according to Taste of Country magazine. Ultimately, Underwood became a vegan, due to being lactose-intolerant. (Credit: Getty Images)

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Natalie Portman

Actress Natalie Portman, who grew up in Jericho,
Actress Natalie Portman, who grew up in Jericho, is a vegan, but she went back to vegetarianism when she became pregnant, according to ABC News. (Credit: AP / Joel Ryan)

Sir Paul McCartney

This former member of The Beatles is a
This former member of The Beatles is a longtime vegetarian. In 2014 Sir Paul McCartney appeared in a promotional video asking for the public's support in Meat-Free Mondays. (Credit: Getty Images)

Olivia Wilde

Actress Olivia Wilde is a longtime vegetarian, who
Actress Olivia Wilde is a longtime vegetarian, who is now vegan. "[Being vegan] is not always easy and accessible, but it's a way of life and makes me as a person feel really good and physically look better. My skin was better, energy was better," she told The Huffington Post. (Credit: Getty Images / Emma McIntyre)

Ellen DeGeneres

Animal rights activist and comedian Ellen DeGeneres was
Animal rights activist and comedian Ellen DeGeneres was named PETA's Woman of the Year in 2009, according to the group's site. (Credit: Getty Images / Kevork Djansezian)

Anthony Kiedis

Anthony Kiedis of Red Hot Chili Peppers was
Anthony Kiedis of Red Hot Chili Peppers was 2008's World's Sexiest Vegetarian Celebrity, according to PETA. (Credit: Getty Images)

Kristen Bell

Actress Kristen Bell was on a vegan diet
Actress Kristen Bell was on a vegan diet for less than two years before becoming a vegetarian again when she was pregnant with daughter Lincoln, according to WebMD. (Credit: AFP, Getty Images / Valerie Macon)

Tobey Maguire

Actor and producer Tobey Maguire was a longtime
Actor and producer Tobey Maguire was a longtime vegetarian until he became vegan in 2009, reports Shape magazine. (Credit: Getty Images)

Pamela Anderson

Actress Pamela Anderson has collaborated with PETA on
Actress Pamela Anderson has collaborated with PETA on various campaigns, including the "I'd Rather Go Naked Than Wear Fur" and "Turn Over a New Leaf -- Try Vegetarian" campaign, says vegan.com. (Credit: Getty Images )

Mike Tyson

Former heavyweight boxing champion Mike Tyson says he
Former heavyweight boxing champion Mike Tyson says he became a vegan to improve his health. "I was so congested from all the drugs and bad cocaine, I could hardly breathe, [I had] high blood pressure, [was] almost dying [and had] arthritis. And once I became a vegan, all that stuff diminished," he said on an episode of "Oprah: Where Are They Now?," via ABC News. (Credit: AP)

Russell Brand

PETA dubbed English comedian Russell Brand
PETA dubbed English comedian Russell Brand "Sexiest Vegetarian Celebrity" in 2011. (Credit: AP)

Former President Bill Clinton

Former President Bill Clinton embraced a plant-based diet
Former President Bill Clinton embraced a plant-based diet and became a vegan to improve his health, according to AARP. (Credit: Getty Images)