London, Nov 23 Robert Pattinson has admitted that he is jealous of 'Twilight' co-star Taylor Lautner's muscles.

Pattinson, who is now starring with Lautner in the vampire sequel 'New Moon', said that he was taken aback by seeing his co-star's pumped up body.

"It was incredibly annoying when I saw Taylor's transformation," the Sun quoted Robert as saying.I realised just having a pre-pubescent girl's body wasn't going to work for me any more.

"In fact I saw him and thought 'Jesus, I'm going to get fired,'" he added.

Inspired from Lautner, the British heartthrob hit the gym too and it's paying dividends - especially in America where the 'Twilight' sequel is shattering box office records. (ANI)