Robert Pattinson and Kristen Stewart have finally premiered their vampire love epic, 'Twilight' in LONDON

Ouch! And ouch again!

Method acting? Vampire-playing Robert Pattinson admits he sometimes slips into character when he's out with the ladies.

"I've been known for a little nibble," he told reporters at the London premiere of his film Twilight.

Mr. Pattinson's co-star, meanwhile, shared one of his less-successful efforts to impress the opposite sex. "He tried to pick me up ... and he pulled his groin," zei Kristen Stewart, 18. "It was hilarious! He was hurt, but he was laughing."

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