Bradley Cooper stripped off his shirt when he took a dip in the ocean in Rio today. His shirtless swim occurred the morning after he premiered The Hangover Part III in the Brazilian city alongside his costars Zach Galifianakis and Heather Graham. Bradley must have gotten a tip about the perfect swim conditions from his costars as the entire Hangover cast hit the beach without him yesterday. The gang has been on a whirlwind trip around the globe as they do press for the final installment of the Hangover trilogy. Bradley, Zach, and the rest of the cast premiered the film in the States last week, and they did promotional duties for the flick in Paris over the weekend. French fans went crazy for Bradley Cooper, who made many hearts flutter several years ago when he revealed that he is fluent in French.