4/26/2009 in Mary Kate Olsen to serve as judge at the Tribeca Film Festival. Sophie Duensing Starlet Mary Kate Olsen will be serving as one of the judge's at the 4th annual Tribeca Film Festival, *USA Today* reported. "I wish there was a class. It's a huge honor to be a part of it. I've been watching the movies. I just started, so I don't know what we do or what's going to happen. This is the first night, really," Olsen said at a Chanel dinner Thursday for the festival. I got my pamphlet this morning. I already watched all the shorts and am going to re-watch them. This is fun." Several other stars were present at the event, including co-sponsor Robert De Niro, who refused to speak with any press. The Tribeca Film Festival will run through May 3.