Tim Gunn has hit out at Taylor Momsen, calling her a “diva” and a “brat.” The fashion mogul and Project Runway mentor shot a guest appearance in an episode of this season’s Gossip Girl, the teen drama which Taylor stars in alongside Leighton Meester, Blake Lively and Chace Crawford. Tim says he was shocked to discover 17-year-old Taylor was unprepared and blasted her for spending too much time on her cell phone. “What a diva! She was pathetic, she couldn’t remember her lines, and she didn’t even have that many. I thought to myself, ‘Why are we all being held hostage by this brat?’” he revealed in an interview with E! News. However, Tim described all of Taylor’s Gossip Girl colleagues as being a “delight” to work with.