NUP_144992_0173.jpgThe twelfth season of the NBC hit reality series The Biggest Loser premieres tonight 8/7 central on NBC. When viewers tune in tonight they will notice a few changes in the show. Beloved trainer Jillian Michaels has moved on, and last season’s new trainers Cara Castronuova and Brett Hoebel are also gone  But trainer Bob Harper returns and is excited about some of the changes on the show, which welcomes new trainer (and former tennis star) Anna Kournikova

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