Robert Downey Jr., Mike Tyson, Diddy drop in on 'Hangover 2' premiere

Bradley Cooper, Zach Galifianakis, Ed Helms, Todd Phillips

Like the movie itself, the world premiere of "The Hangover Part II," held in Los Angeles on Thursday, was somewhat of a kitchen sink affair. The film's stars Bradley Cooper, Ed Helms, Mike Tyson, Ken Jeong, Jamie Chung and Zach Galifianakis rubbed shoulders with such notable guests as Robert Downey Jr., Kristen Bell, Diddy and Laker Ron Artest. Plus, there was a monkey!


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