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Rumors abound that NBC has found its replacement for Jillian Michaels on The Biggest Loser: Tennis bombshell Anna Kournikova?

X17 was first to report that Kournikova, 29, will replace tough-love trainer Michaels, who left the show last year to pursue other projects (including adopting a child).

NBC welcomed new trainers Cara Castronuova and Brett Hoebel to the cast at the start of the season -- but declined to confirm or deny the current Kournikova talk.

"We will make a big announcement tonight at the finale for next season," an NBC rep told Us Weekly simply of the rumor.

Where has Kournikova been lately, anyway? Although once ranked no. 8 in singles and no. 1 in doubles, the sexy athlete -- and longtime love to Enrique Iglesias -- has only competed once in the past eight years.

Tell Us: Would Kournikova make a good Loser trainer?