Russian-American tennis pro Anna Kournikova is set to replace Jillian Michaels as star trainer in the reality TV show The Biggest Loser. Kournikova who was born in Moscow became an American citizen in November of 2010. She once ranked no. 1 in the world, although she has never actually won a WTA in singles. She ruled in the doubles with friend Martina Hingis. The dashing duo was known both for athleticism and beauty. Kournikova cashed in on her sex symbol status and has raked in millions with modeling and sponsorship gigs. She also appeared in a steamy music video with Enrique Iglesias, her now long-time boyfriend. Grrrreat.