'Project Runway' Sneak Peek: Karlie Kloss Surprises Designers With High-Pressure Challenge (Exclusive)

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Celebrity stylist Karla Welch and Karlie Kloss on Bravo's 'Project Runway.'
Bravo

The pressure is on, on Bravo’s Project Runway.

In ET's exclusive sneak peek at Thursday’s all-new episode, mentor Christian Siriano surprises the designers directly after their last runway -- someone even cries out, "Oh god, you’re back!" -- to let them know host Karlie Kloss is waiting for them with a “special guest” on the runway. That guest is Karlie's stylist, Karla Welch, who also dresses A-listers like Sarah Paulson, Justin Bieber and Tracee Ellis Ross.

"I brought Karla here for a reason," Karlie announces to the designers. "In a couple of months, I’m attending a CFDA event in Paris and I need your help creating the perfect look."

The CFDA is the Council of Fashion Designers of America, a non-profit organization focused on developing American design talent through scholarships and other programs. In fact, part of the prize package for Project Runway is a "career-changing mentorship" with the organization.

"This is an amazing, magical moment as a designer," contestant Nancy Volpe-Beringer remarks. "One, it's Karlie. Two, it's in Paris. Three, it's for the CFDA? That's the trifecta."

Check it out here:

Project Runway airs Thursdays at 9 p.m. ET on Bravo.

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