From the director of "Old School" comes a new comedy about a bachelor party in Vegas gone horribly wrong. Two days before his wedding, Doug (Justin Bartha) and his three buddies (Bradley Cooper, Ed Helms, and Zach Galifianakis) drive to Vegas for a night they'll never forget. But when the three groomsmen wake up the next morning with pounding headaches, they can't remember a thing and the groom is nowhere to be found. With little time to spare the trio must attempt to retrace their bad decisions from the night before in order to get Doug back to LA in time for his wedding. Soundtrack features performances by The Dan Band and Mike Tyson. Every bad hangover starts with a great party album.