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May 5, 2015

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"The Hangover" actors, from left, Zach Galifianakis, Bradley Cooper, Ed Helms and Justin Bartha, appear in a scene at Caesars Palace's reception area.

FRANK MASI / WARNER BROS.

"The Hangover" actors, from left, Zach Galifianakis, Bradley Cooper, Ed Helms and Justin Bartha, appear in a scene at Caesars Palace's reception area.