Anna Kournikova Joining “The Biggest Loser

We hear tennis ace Anna Kournikova is putting down her racket and picking up a bull horn to whip overweight reality stars into shape on the next season of NBC’s The Biggest Loser.

The towhead sportswoman is expected to replace hardnosed trainer Jillian Michaels on the judges’ panel this fall. Michaels is leaving Loser after 11 season to focus on starting a family; she’s in the process of adopting a child from overseas. Kournikova would join new judges Cara Castronuova and Brett Hoebel, who have already been announced as part of the new team. Kournikova made a guest appearance on the program last October. NBC heads are staying mum for now, but the network is expected to make the formal announcement about Anna’s future with the show during The Biggest Loser season finale, Tuesday, May 24 @ 8 PM ET on NBC.

The tennis player was just 15 when she made her debut at the 1996 US Open. A pinup favorite, Anna was voted ESPN’s “Hottest Female Athlete.”

Anna, who turns 30 on June 7, has been dating singer Enrique Iglesias for eight years.