Tim Gunn approves! The Biggest Loser's Monday, February 8, episode features the Project Runway mentor offering feedback to contestants during their makeovers, as seen in Us Weekly's exclusive sneak peek.

In the clip, Lauren Clark tries out her new wardrobe in front of a mirror. Her initial look pairs a blue dress with a black jacket.

"Can I tell you something?" Gunn, 62, asks. "You're hot. It's stunning, and you look smashing in it."

The 32-year-old single mom from North Carolina replies, "I feel smashing in it. I feel really pretty."

"I see somebody I don't really recognize," she says after trying on a second outfit. "I feel really good about myself right now."

Watch the video above to see Clark discuss her previous unhappiness.

The Biggest Loser airs on NBC on Mondays at 9 p.m. EST. Trainer Dolvett Quince recaps each season 17 episode exclusively for Us Weekly. 

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