She's never really needed to lose anything, well except Enrique Igelsias as a boyfriend. :) She has however lost a lot of tennis matches and it looks as though she'll be showing others how to lose big.
Anna Kournikova will join The Biggest Loser starting next season as a trainer.
It was reported recently that Jillian Michaels' was set to leave the show after this season.
Look for the official announcement of Anna joining the show on Tuesday night after the season finale.