Kristen Stewart risked a wardrobe malfunction at Cannes on Friday by wearing a red dress that showed off plenty of cleavage.

The On the Road star was at the premiere of boyfriend Robert Pattinson's new movie, Cosmopolis, but the couple kept their distance at the event.

Kristen spent most of the night with her date for the evening, actor Tom Sturridge, who is Robert's best friend. Sturridge and his girlfriend Sienna Miller are expecting their first child later this year.

Pattinson spent most of the evening promoting the film with his castmates, including Paul Giamatti and Juliette Binoche.