Washington, Apr 7: Hollywood actor Rob Pattinson was left red-faced on the first day of filming for his forthcoming flick ‘Twilight’, after he suffered a muscle pull in his buttocks.

Rob was required to lift heroine Kirsten Stewart in one of the scenes, when he pulled a muscle in his rear end.

He had to pull out from the shoot after he damaged ligaments in his rear end, and was forced to undergo a butt-rub.

"I got injured on the first shot of my first day on Twilight. I lifted Kristen and ripped my a**e cheek. I had to get a bum massage for the cheek,” Contactmusic quoted Rob as telling Cosmopolitan magazine. (ANI)