"The Hangover Part II" premiere black carpet arrivals at Grauman's Chinese Theatre in Los Angeles, California USA May 19, 2011 - On the black carpet Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha, Ken Jeong, Mike Tyson, Mason Lee, Jamie Chung, Sasha Barrese, Crystal the Monkey, Yasmin Lee, Kristen Bell, Blake Griffin, Maria Menounos, Terri Seymour, Jay Manuel, Alyssa Milano, Jason Bateman, Jordin Sparks, Robert Downey Jr.