Kristen Stewart slipped out of her Reem Acra gown and into a Dolce & Gabbana t-shirt and sexy black shorts for Robert Pattinson's Cosmopolis Cannes Film Festival afterparty. Earlier in the evening, Rob hit the red carpet solo at the film's formal premiere, while Kristen stuck close to his best friend, and her On the Road costar, Tom Sturridge. The trip to France came right in the middle of Kristen's international Snow White and the Huntsman press tour. The film opens in theaters June 1, and Kristen's headed back to the states next week for a few more promotional stops. As for Rob, he's in the running for two of the hottest roles in Hollywood. New reports say Rob's considering the part of Finnick Odair in Catching Fire, the follow-up to The Hunger Games, and he's among the sexy guys competing to play Christian in Fifty Shades of Grey.