You're right about it being a big, big day, Tim: Tonight, the four remaining designers show their final collections to Nina, Heidi, Zac and guest judge Emmy Rossum.
The contenders might have made it to the big time, aka New York Fashion Week, but it's far from smooth sailing. They growl in frustration, exhale deeply, and sprint around backstage like Usain Bolt during the 100-meter dash.
"I don't think we've ever had a race this close," says Heidi as she makes bumper car motions with her hands.
Who will cross the finish line first? Watch Project Runway at 9 p.m. EST on Lifetime.