But the star of the forthcoming film About A Boy would still jump at the chance of taking her out on a date.
Grant said, "I wish Britney wouldn't go on exercise machines so often, it can give women big thighs."
He says he would prefer to go out with Britney rather than Madonna if he had a chance. "I love them both, of course," he said. "But if I had to decide who to ask on a date, I'd have to say Britney. She's special."