Kim Kardashian filmed an upcoming episode of "Project Runway" today -- where the challenge was definitely one of the show's biggest ever!

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Kim joined Heidi Klum, Michael Kors, Nina Garcia and Tim Gunn in NYC on Friday, where they all watched as models on stilts showed off some gigantic gowns during a public, outdoor runway show.

Klum and Kardashian both wore LBDs for the occasion -- and we're loving Heidi's asymmetrical cut and sleek, pulled back 'do.

Kim's appearance on the show is a bit of a surprise, considering the nasty words Gunn had for her and her sisters last year. He repostedly told MSN's Wonderwall "I just think the Kardashians have an absence of taste and I don't think that that should be perpetuated. I'm sorry I'm sounding like an old farty snob but it bothers me."

Guess we'll see if there's any drama between the two when "Project Runway" stars back up July 28 on Lifetime.

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