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Sharing the screen with super-buff Taylor Lautner is bound to give anyone a complex, even Robert Pattinson. In fact, the 'Breaking Dawn' star admits that his co-star's abs inspired him to work out for six months prior to shooting his intimate scenes with Kristen Stewart.

"You also have to worry about how you're going to look," he told Mexican magazine 15a20 (via Page Six) about being minimally clothed on the big screen. "I had never been so worried about that before, but after seeing how much Taylor [Lautner] works out for the movies, I thought, 'Well, everybody is really going to judge me now.' I always tried to think about positions where I could tense the muscles, and suck in my belly."

Rob reportedly went through intense training to bulk up for his role, which, as many Twi-hards know includes a controversial sex scene. "The body of the characters seem to be a big deal. So in this movie, I thought, 'OK, it's the last one, I'm getting a six pack,' and I tried, but it's very hard," the British star added.

At least that's one thing he and Taylor can commiserate about. Will Rob be keeping up with the intense workout regimen? Probably not. He said, "I worked out so hard for six months, so after filming the sex scene, the first thing I thought was, 'Time to eat!'"

By Nadine Cheung