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

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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.