Heather Graham in Warner Bros. Pictures' The Hangover - 2009

Warner Bros. Pictures' The Hangover - 2009

Justin Bartha in Warner Bros. Pictures' The Hangover - 2009

Mike Tyson in Warner Bros. Pictures' The Hangover - 2009

Ken Jeong in Warner Bros. Pictures' The Hangover - 2009

Warner Bros. Pictures' The Hangover - 2009

Warner Bros. Pictures' The Hangover - 2009

Photo by Warner Bros. PicturesBradley Cooper stars in Warner Bros. Pictures' The Hangover - 2009

Photo by Warner Bros. PicturesEd Helms stars in Warner Bros. Pictures' The Hangover - 2009

Photo by Warner Bros. PicturesZach Galifianakis stars in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis, Bradley Cooper, Justin Bartha and Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis, Bradley Cooper and Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Bradley Cooper and Zach Galifianakis in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis in Warner Bros. Pictures' The Hangover - 2009

Ed Helms and Heather Graham in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis, Ed Helms, Justin Bartha and Bradley Cooper in Warner Bros. Pictures' The Hangover - 2009

Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis, Bradley Cooper and Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis, Bradley Cooper and Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Bradley Cooper, Zach Galifianakis and Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Ed Helms, Zach Galifianakis and Bradley Cooper in Warner Bros. Pictures' The Hangover - 2009

Ed Helms and Bradley Cooper in Warner Bros. Pictures' The Hangover - 2009

Baby Tyler in Warner Bros. Pictures' The Hangover - 2009

Bradley Cooper in Warner Bros. Pictures' The Hangover - 2009

Sasha Barrese in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis, Bradley Cooper and Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Bradley Cooper, Zach Galifianakis and Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Ed Helms, Zach Galifianakis, Mike Tyson and Bradley Cooper in Warner Bros. Pictures' The Hangover - 2009

Bradley Cooper, Zach Galigianakis, Ed Helms and Justin Bartha in Warner Bros. Pictures' The Hangover - 2009

Ed Helms, Bradley Cooper and Zach Galifianakis in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis, Ed Helms and Bradley Cooper in Warner Bros. Pictures' The Hangover - 2009

Ken Jeong in Warner Bros. Pictures' The Hangover - 2009

Photo by Frank Masi/Warner Bros. PicturesZach Galifianakis, Bradley Cooper and Ed Helms in Warner Bros. Pictures' The Hangover - 2009

Ed Helms, Heather Graham and Zach Galifianakis in Warner Bros. Pictures' The Hangover - 2009

Jeffrey Tambor, Sasha Barrese and Sondra Currie in Warner Bros. Pictures' The Hangover - 2009

Ed Helms and Rachel Harris in Warner Bros. Pictures' The Hangover - 2009

Photo by Frank Masi/Warner Bros. PicturesEd Helms, Zach Galifianakis and Bradley Cooper in Warner Bros. Pictures' The Hangover - 2009

Bradley Cooper in Warner Bros. Pictures' The Hangover - 2009

Zach Galifianakis in Warner Bros. Pictures' The Hangover - 2009

Justin Bartha in Warner Bros. Pictures' The Hangover - 2009

Mike Tyson in Warner Bros. Pictures' The Hangover - 2009

Heather Graham in Warner Bros. Pictures' The Hangover - 2009

Todd Phillips on the set of Warner Bros. Pictures' The Hangover - 2009

Director Todd Phillips and Ed Helms on the set of Warner Bros. Pictures' The Hangover - 2009

Photo by Warner Bros. PicturesWarner Bros. Pictures' The Hangover - 2009