Mondo Guerra didn't win the latest season of "Project Runway" -- but he's still got Heidi Klum in his corner, because last night she wore one of his divisive dresses on the red carpet!

In the finale, Mondo's "polka-dot dress" was a source of argument for the judges -- and while Klum and Jessica Simpson loved it, Michael Kors and Nina Garcia definitely didn't. At one point, Kors even dared Klum to wear it -- and now she has.

Heidi showed up the AFI Fest presentation of "Black Swan" on Thursday in Guerra's skin-tight gown -- and we want to know what you think of it.

Check out the pics, plus shots of Natalie Portman, Mila Kunis, Winona Ryder and more at the premiere!

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