Robert Pattinson refused to bare all for his new movie.


The British heartthrob stars in David Cronenberg's Cosmopolis, and although he is a huge fan of the director and had promised to do anything he asked, he drew the line at frontal nudity.

"Five minutes before we filmed, David told me, 'I want to see the bottom of your balls on the top of the frame.' At the moment, I reminded myself that I would do anything for him. So I went back to see him and told him that wouldn't happen. He took it really well. At the start, it's a very bizarre scene that you won't see again in another movie, I promise," he said.

While he enjoyed making the movie - based on the novel by Don DeLillo - he admitted he was anxious he wouldn't be good enough for the role: "I spent two weeks in a hotel room worrying and confusing myself."

Robert is currently at the Cannes Film Festival where he attended the red-carpet premiere of girlfriend Kristen Stewart's film, On the Road on Wednesday and the couple are also expected to attend tonight's screening of Cosmopolis together.