Briana Evigan as Cassidy Tappan

Leah Pipes as Jessica Pierson

Rumer Willis as Ellie Morris

Jamie Chung as Claire Wen

Julian Morris as Andy Richards

Margo Harshman as Chugs Bradley

Carrie Fisher as Mrs. Crenshaw

Audrina Patridge as Megan Blaire

Matt O'Leary as Garret Bradley

Maxx Hennard as Mickey Donaldson

Matt Lanter as Kyle Tyson

Justine Wachsberger as Sarcastic Sister

Rick Applegate as Senator Tyson

Debra Gordon as Mrs. Tappan

Caroline D'Amore as Maggie Blaire

Adam Barrie as Danny

Nikki Moore as Joanna

Deja Kreutzberg as Riley

Teri Andrzejewski as Bra-Clad Sister

Robert Belushi as Amazed Senior Guy

Marie Blanchard as Over-It Sister

Ken Bolden as Dr. Rosenberg

Megan Wolfley as Trampoline Sister

Zack Garrett as Thwarted Guy

Ashtin Petrella as Already Drunk Sister

Melissa Lukon as Slutty Sister

Joe Forgione as Sea Pig

Kelly Dessoye as Naîve Girl #1

Katie Woolridge as Naîve Girl #2

Jeff Krajci as Stoned Dude

Joanna Waldsmith as Ditzy Sister

Natalia Dove as Bucky

Justin Tully as Wasted Guy

Chaton Anderson as Christina

Nayli Russo as Core Sorority Sister

Matt Cannon as Nerdy Underclassman