Fabulous guest judge alert! Diane von Furstenberg joined Heidi, Michael, and Fern Mallis (filling in for Nina Garcia) to critique the designs of the Project Runway contestants. Their challenge was to create a look that would fit seamlessly into Diane's Fall collection. Diane herself offered the perfect inspiration as she was wearing a dress from her namesake line. Follow Diane's lead and pair it with a men's watch.

Photos courtesy of Bravo.