It's makeover week on "The Biggest Loser," and no one less than "Project Runway"'s fashion guru TIM GUNN drops by the campus to help the contestants "make it work" and develop a fashion sense for their new bodies.

"Tim Gunn is amazing," declares BRITTANY, who has lost 49 pounds. "When he walked out, I was blown away that he was here and going to help us. When I walked out in the blue dress that I picked out for myself, he said, 'You look ready for the red carpet right now. You look great.'"

Much to Brittany's delight, the dress that Tim picks out for her to walk down the runway in is quite a sexy little number in plum with an incredible décolleté.

"He said that I have the movie star glamour look," Brittany continues. "The dress that he chose for me today, I am very excited about but nervous. It is something that I would have always wanted to wear when I was bigger but now that I am able to try and slide into something like that, it is a little nerve-wracking."

"The Biggest Loser" makeover episode airs Tuesday, March 18 at 8 p.m. on NBC.