Robert Downey Jr., Mike Tyson and Diddy drop in on 'Hangover 2' premiere
Kristen Bell also hangs with stars Bradley Cooper, Ed Helms and Zach Galifianakis
Kristen Bell with Crystal the monkey
Guest Kristen Bell monkeys around with "Hangover Part II" star Crystal at the premiere.
See more monkey-related madness in these photos from the film.
Photo Credit: Chris Pizzello/AP Photo
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