'Girls' Star Rocks The 'Runway' - EXCLUSIVE CLIP

Allison Williams has quickly established herself as one of Hollywood's most promising new style stars and the Girls actress cements that status by serving as guest judge on Thursday's all-new episode of Project Runway.
ETonline scored an exclusive sneak peek at Allison's Runway debut, which elates all the remaining designers. Watch!
Project Runway airs Thursdays at 9 p.m. on Lifetime.