Over the years, Project Runway's crop of designers have been tasked with dressing Miss Piggy, toddlers and even tiny pooches -- but the All Star contestants' biggest hurdle might just be designing for male models.

On the Lifetime hit's Nov. 29 episode, the remaining nine designers are given a tall order: Create looks for nine hunky male models! In a sneak preview from Thursday's episode, All Stars judge Georgina Chapman delivers the good -- err, bad -- news.

"Georgina Chapman walks in and I'm just thinking, 'Oh s--t!" season 9's Anthony Ryan Auld says before learning the episode's latest twist. Once Chapman makes her announcement, the workroom quickly erupts in chaos. "Oh, my God -- that's impossible!" Uli Hernzer yelps. Says Emilio Sosa: "I feel completely screwed right now!"

Auld's season 9 colleague Laura Kathleen, however, is cautiously optimistic about her latest challenge. "You are f--king kidding me! Thank God I left a massive amount of seam allowance," she says.

Project Runway All Stars airs Thursday at 9 p.m. (EST) on Lifetime.