Entertainment 'Law & Order' celebrity guest stars we can't forget By Nina Ruggiero Updated August 24, 2016 9:08 AM Print Share fbShare Tweet Email After swearing off New York City and public life, temperamental actor Alec Baldwin made his "Law & Order: Special Victims Unit" debut March 19, 2014, playing none other than a newspaper columnist. Was it memorable? Definitely. But these are a few other celebrity guest stars that stuck with us all these years later. Philip Seymour Hoffman Photo Credit: Getty Images / Mark Mainz Back in 1991, a then-unknown PSH scored his TV debut as a drug dealer and rapist in the first season of "Law & Order." Samuel L. Jackson Photo Credit: Getty Images The already established actor lent his talents to "Law & Order" in the same 1991 episode as Seymour Hoffman's lawyer. Julia Roberts Photo Credit: Getty Images / Dave Kotinsky Julia Roberts was dating "Law & Order" actor Benjamin Bratt back when she guest starred on season 9, and she spent most of the episode seducing his character. It was awesome. Jennifer Garner Photo Credit: Getty Images Speaking of seducing Rey Curtis, Jennifer Garner also got her shot, and she made it count -- the detective and graduate student had a steamy affair. Robin Williams Photo Credit: Getty Images / Peter Kramer Robin Williams was so convincingly creepy on "Law & Order: Special Victims Unit" as an engineer who makes prank phone calls to SVU officials and drives a doctor to suicide that he was nominated for an Emmy for his 2008 performance. John Stamos Photo Credit: Getty Images / Frazer Harrison It's hard to believe that someone this adorable played someone who was obsessed with impregnating women, but his "Law & Order" season 12 character fathered almost 50 children. Ludacris Photo Credit: Getty Images / Kevin Winter "Law & Order" gave Ludacris the chance to prove he's more than just a rapper -- his role made such an impact he was asked to reprise it in a second episode. Hayden Panettiere Photo Credit: Getty Images / Michael Buckner A young Panettiere is so cute in "Law & Order" season 2 as a child of suspected abusive parents, that even Olivia Benson gets attached. The actress then came back to the franchise for season 6 of "Law & Order: Special Victims Unit" as a rebellious teen. By Nina Ruggiero Share on Facebook Share on Twitter Comments We're revamping our Comments section. Learn more and share your input.