The wolfpack is back! Bradley Cooper, Ed Helms, and Zach Galifianakis premiered the third and final installment of The Hangover trilogy in Los Angeles last night, along with co-stars Jamie Chung (in Armani and Gaydamak jewels) and Heather Graham (in Herve L. Leroux). For the epic finale, the boys are back in Las Vegas for one last hurrah. What happens? Find out when The Hangover Part III opens nationwide Thursday, May 23.

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