Credit: Andrew H. Walker/Getty

With her new denim line in stores now, it s only fitting that Jessica Simpson is getting her fashionable feet wet at the runway shows of New York City Fashion Week. And on Thursday, the starlet made a trip to the Project Runway finale, where she was announced as the surprise guest judge.

In a shimmering gray mini-dress, Simpson joined judges Michael Kors, Nina Garcia and Heidi Klum on the catwalk, then got down to business, evaluating the looks of the show s finalists. But since only six Runway episodes have aired so far on Lifetime, all 10 of the remaining designers presented collections so that the results of the finale will not be revealed.

With celebs like Jordin Sparks and Jamie-Lynn Sigler looking on, the contestants put forth a variety of designs. Mondo s collection was full of pink and polka dots, while Gretchen went with more muted tones. Valerie s playful dresses and vests were right out of a Katy Perry video, and her pal Ivy presented a beach-inspired collection. Andy, April, Casanova, Christopher, Michael C. and Michael D. shared their lines, as well.