The tennis celebrity is to appear on Tuesday's edition of the show.
"From sparks of drama in the house, an early and dramatic weigh-in and Kournikova's surprise visit, to an intense challenge and an especially inspiring 'Where are they now?' segment with this week's eliminated contestant, it's an unforgettable episode of can't-miss moments on 'The Biggest Loser,'" the network said in a news release. "The week kicks off with one contestant expressing a wish to go home, which creates drama and tension in the house, while another group of players form a secret alliance."
Swim Week Miami Beach 2014 [PHOTOS]