Bradley Cooper and his The Hangover Part II castmates Ed Helms, Zach Galifianakis, Justin Bartha, and Jamie Chung greeted fans at last night's Berlin premiere. The sequel, which hits theaters today, throws the wolf pack back into familiar circumstances after another bachelor party goes awry — read The Hangover Part II reviews to see what critics think of how the new installment compares to part one. The stars and director Todd Phillips had their first screening event last week on the West Coast, and made a stop in NYC for another showing earlier this week. Bradley managed to swing by SNL during his stay in the Big Apple, and joined host Justin Timberlake for the afterparty with Olivia Wilde. Bradley and Olivia were spotted sharing an intimate chat during the soiree, fueling rumors that they're dating.