London got a large dose of star power on Wednesday when the cast of The Hangover hit the red carpet to premiere the third instalment of their franchise. Bradley Cooper, Justin Bartha, Ed Helms, Zach Galifianakis, Todd Phillips, Ken Jeong and Heather Graham met up in front of the cameras to pose for pictures and chat among themselves, flashing plenty of smiles along the way. It was their second big event of the week after also bringing the movie to LA on Monday. It looked like Zach was on his best behaviour in the UK following his funny antics at the West Coast premiere — Zach hopped into a car trunk before walking the carpet with his formerly homeless friend, Mimi Haist.
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