James Franco as James Franco

Jonah Hill as Jonah Hill

Seth Rogen as Seth Rogen

Jay Baruchel as Jay Baruchel

Danny McBride as Danny McBride

Craig Robinson as Craig Robinson

Michael Cera as Michael Cera

Emma Watson as Emma Watson

Mindy Kaling as Mindy Kaling

David Krumholtz as David Krumholtz

Christopher Mintz-Plasse as Christopher Mintz-Plasse

Rihanna as Rihanna

Martin Starr as Martin Starr

Paul Rudd as Paul Rudd

Channing Tatum as Channing Tatum

Kevin Hart as Kevin Hart

Aziz Ansari as Aziz Ansari

Samantha Ressler as Karen (Franco's Asst.)

Douglas M. Griffin as Father in Store

Lo Graham as Daughter in Store

Carol Sutton as Cashier

Yohance Myles as Cell Phone Guy

Richard Holden as Priest

Brian Huskey as Headless Man

Randy Rousseau as News Reporter

Travers Mackel as News Reporter

Amber Carew as Cera Girl #1

Dallas West as Cera Girl #2

David Jensen as Cannibal #1

Jack Flynn as Cannibal #2

Carey Jones as Rape Demon

Ricky Mabe as Santa Cannibal

Jason Cox as Paparazzi

Nick Carter as Backstreet Boys

Howie Dorough as Backstreet Boys

Brian Littrell as Backstreet Boys

AJ McLean as Backstreet Boys

Kevin Richardson as Backstreet Boys

Will Addison as Party Hipster (uncredited)

Edward J. Clare as Capt. Angelo (uncredited)

Dwight V Coleman as Hick (uncredited)

John Darko as Partygoer (uncredited)

Ashleigh Dejon as Partygoer (uncredited)

Michelle DeVito as Partygoer (uncredited)

Z. Dieterich as Melrose Driver (uncredited)

Tammy Dugen as Greek Woman (uncredited)

Evan Goldberg as Evan Goldberg (uncredited)

Damian Gomez as Backstreet Boys Backup Dancer (uncredited)

Steffie Grote as LA Hipster / Driver (uncredited)

Devin Hennessy as Disco Dude (uncredited)

Ashley Lambert as Party Girl (voice)

Chi Muoi Lo as Jang (uncredited)

Brittany Perry-Russell as Heaven's Angel (uncredited)

Erin Rementer as Flight Attendant (uncredited)

Met Salih as Partygoer (uncredited)

Jordan Sudduth as Partygoer (uncredited)

Brandon Trost as Cannibal (uncredited)

Jason Trost as JTRO (uncredited)

Joseph Uzzell as Airport Passenger (uncredited)

Syd Wilder as Angel (uncredited)

Jason Segel as Jason Segel (uncredited)