Celebrated chef Rocco DiSpirito will guest star on NBC's hit weight loss series "The Biggest Loser: Couples" on Tuesday, February 5 (8-10 p.m. ET), judging the contestants as they engage in a cook-off challenge to prepare a tasty – but low calorie – three-course dinner for the famous chef.

Only 11 contestants are left in the game, and this week, host Alison Sweeney has the blue and black teams square off in a culinary challenge that will test their ability to cook a meal that is as healthy as it is flavorful. With the clock ticking, the two teams shop for and then prepare an appetitizer, entrée and dessert for DiSpirito, who will then choose the best meal based on taste, nutrition and calorie count. The winning team gets a delicious meal prepared by DiSpirito, as well as a special surprise from home for each of the winning contestants.

Also, one team faces a setback this week when one of their strongest players suffers an injury that dramatically impacts his workout routine, and another contestant gets a very welcome visit from a surprise guest. In the elimination room, a shocking betrayal stuns the players as another contestant is sent packing. Bob Harper is the trainer for the blue team, and Jillian Michaels is the trainer for the black team.

Recognized as one of the leading chefs of his generation, DiSpirito recently released his latest cookbook, Rocco's Real Life Recipes: Fast Flavor for Every Day. In 1997, DiSpirito opened Union Pacific in New York City's Gramercy Park as chef and owner to rave reviews, and was later named Food & Wine's "Best New Chef" in 1999, and named "America's Most Exciting Young Chef" by Gourmet magazine in 2000. DiSpirito opened Rocco's 22nd Street in the summer of 2003, documented on NBC's series "The Restaurant," and the second season aired in the spring of 2004. Seen regularly on the "Today" show, DiSpirito is the author of Flavor, Rocco's Italian American and Rocco's 5 Minute Flavor: Fabulous Meals with 5 Ingredients in 5 Minutes. He is currently working on his next book and will soon begin shooting a new cable television series.

"The Biggest Loser: Couples" is a production of Reveille LLC, 25/7 Productions and 3Ball Productions. Ben Silverman (NBC's "The Office," "Ugly Betty"), Dave Broome ("A Model Life with Petra Nemcova," "Tsunami Aid: A Concert of Hope"), JD Roth ("Age of Love," "Beauty and the Geek"), Todd A. Nelson ("Unan1mous," "Beauty and the Geek") and Mark Koops ("American Gladiators," "Shear Genius") serve as executive producers.