Hangover II' premiere

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Stars of "Hangover Part II" attend Los Angeles premiere Thursday, May 19, 2011.

Mike Tyson greets "Hangover Part II" star Bradley Cooper at the Los Angeles premiere of the sequel to the blockbuster film of 2009. Tyson is in the second film making another cameo appearance.

"Hangover Part II" star Ed Helms inspects the poster of his character at the premiere.

"Hangover Part II" co-stars Justin Bartha, Ed Helms and Ken Jeong try to keep co-star Zach Galifianakis (left) from stealing their camera.

Ed Helms (left) and Ken Jeong were, however, happy to get in a few shots with "Crystal the Monkey."

Bradley Cooper shared some camera-time with fans.

"Crystal the Monkey, " a cast member in "The Hangover Part II," works hard to get the cameras' attention at the premiere.

Among the stars present at the premiere was actress Kriten Bell.

"Hangover Part II" cast member Jamie Chung arrives.

Hip-hop mogul Sean "Diddy" Combs and actor Robert Downey Jr. came out in support of the film.

"Hangover Part II" director and co-writer Todd Phillips salutes fans.

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Mike Tyson greets "Hangover Part II" star Bradley Cooper at the Los Angeles premiere of the sequel to the blockbuster film of 2009. Tyson is in the second film making another cameo appearance.

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