One Sex and the City star has decided to strip down in an effort to help the British National Gallery save Titian's Diana and Callisto from being sold to a private owner and moved from Edinburgh's National Gallery. She plans to pose in the buff as Diana for a new take on the painting to raise money ($80 million is needed) and awareness. This isn't the first time she's disrobed for art's sake. Last year, she posed topless to save Titian's Diana and Actaeon. Do you know which SATC star it is?