15 Celebrities Who Appeared on Law & Order: SVU

Amanda Seyfried: In the season-six episode "Outcry," Seyfried portrayed a teen who accuses three military cadets of raping her but is really covering up for her stepfather's boss (the actual rapist).

Brittany Snow: In one of SVU's more bizarre episodes, pre-Pitch Perfect Snow appeared as teenager Jamie Hoskins, who is placed on trial for murder after killing nine people in a suicide attempt while off her bipolar meds (which she stops taking at the advice of a rock star).

Rooney Mara: Joining sister Kate, Rooney had one of her first gigs on SVU in the season-seven episode "Fat" as a high-schooler sexually assaulted in a revenge attack. If you missed her in the ep, don't feel bad—she's hardly recognizable without her Girl With the Dragon Tattoo garb.

Hilary Duff: In one of SVU's ripped from the headlines episodes, Duff played a Casey Anthony-type character who claims her daughter has been kidnapped (until the episode takes an odd, pro-vaccination turn).

Natasha Lyonne: In her SVU appearance, Lyonne sat on the opposite side of the law as a psychiatric-ward patient who helps put her attacker behind bars. (P.S. We've also seen several of her OITNB castmates on SVU over the years, including Pablo Scheiber, Taryn Manning, and Laverne Cox!)

__This list makes me want to curl up on my couch with an SVU marathon, stat. And since we've just barely cracked the surface of all the guest appearances, I want to know—who have been your favorite cameos over the past 15 years?