London got a large dose of star power today when the cast of The Hangover hit the red carpet to premiere the third installment 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. The boys, Bradley, Zach, Ed, and Justin, kept the fun going following the red carpet during an afterparty at London's Roka restaurant. Bradley took the celebrations one step further, attending a house party in Chelsea later that night.
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 behavior 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.
The promotions will continue for the gang in the run-up to their film's Friday premiere. Make sure to check out our review of The Hangover Part III before you head to the theater this weekend!