By People Staff
Updated March 15, 2010 12:00 AM
Credit: Lifetime

Project Runway is welcoming another fabulous guest judge! On this week’s episode, model and actress Molly Sims will join Heidi Klum and Nina Garcia on the judges’ panel while Calvin Klein creative director Francisco Costa fills in for Michael Kors.

“Molly struck that perfect balance between encouraging yet honest constructive criticism. She’s a fan of the show, so her comments were right on,” executive producer Jane Cha tells PEOPLE. “Plus, Molly has worked with Francisco Costa, who was filling in for Michael that week, so there was a nice rapport there.”

In this week’s challenge, the designers hit the streets to find inspiration and work in teams to create designs based on four different New York City neighborhoods.

Project Runway airs Thursday (10 p.m. EST) on Lifetime. Lifetime