Tennis star Anna Kounikova made her reality TV debut Wednesday night as the new host of The Biggest Loser.

Kournikova joins the weight-loss competition show as a replacement for former host Jillian Michaels, who left the show to concentrate on expanding her family.

The Biggest Loser contestants were pleasantly surprised to see the leggy blond beauty arrive via Marine helicopter to the competition filming.

Kournikova appeared on Live with Regis and Kelly as part of a promotional press tour, where she credited her mother for her strength and focus. She really instilled the commitment, disciplinane in me,'' Anna said on Live with Regis & Kelly. It's really helped me throughout life and that's why I'm so passionate about sports and fitness and promoting that healthy lifestyle, and spreading the word especially to kids.

Take a look at the tennis pro in action shots, ranging from when she was just a kid herself to today, when she is an elegant -- and fit -- 30-year old woman.