British actress Keira Knightley has one big regret in life - giving up ballet. The Pirates Of The Caribbean beauty admits her dedication to acting from an early age meant she had to sacrifice other childhood pursuits - namely, her beloved ballet. She says, "I adore the ballet, especially Swan Lake. I try to see as many ballets as I can but it's not something I've thought of doing myself. "You have to start at it very young so I missed out and acting was always my thing."