Former tennis ace-turned-model Anna Kournikova has signed on to put heavyweights through their paces in the new season of hit reality show "The Biggest Loser."
The stunner, who is singer Enrique Iglesias' longtime girlfriend, will be one of the show's trainers, according to
Kournikova will reportedly join fitness experts Cara Castronuova and Brett Hoebel on the program.



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