London, November 10 Robert Pattinson has revealed that he was embarrassed to take off his shirt for a scene in 'Twilight' sequel 'New Moon' after seeing co-actor Taylor Lautner's muscular physique.

Pattinson plays vampire Edward Cullen in the film, while Lautner, who has packed on 30lbs, plays Jacob Black.

"It's really embarrassing, especially when Taylor has a fourteen-pack or something," the Telegraph quoted him as telling Heat magazine.

Actress Kristen Stewart also had a word of praise for Lautner's new look.

She said: "He's an entirely different person physically. It took him so much time. He's so devoted. The cool thing, though, is that it's not just physical. You can read it all over him, just in his attitude.

"The difference between the kid that did Twilight and the guy now is pretty astounding. He even did a lot of his own stunts. He catapulted himself into a window - that was really impressive." (ANI)