Stars popped up both in the front row and on the runway at the Chanel Spring 2014 show during Paris Fashion Week today. Katy Perry got decked out in a black-and-white Chanel ensemble to work her stuff in front of specially created art pieces that were designed for the presentation. She was joined in the front row by Rita Ora, who got to watch her best friend Cara Delevingne strut her stuff on the catwalk in a rainbow number, and Vanessa Paradis. Meanwhile, the show itself was full of surprising runway returns for famous models. Alexa Chung, who used to model before she became a TV host, strutted her stuff down the stage, and Miranda Kerr, who made her Paris Fashion Week 2013 debut yesterday at Stella McCartney, also took over stomping duty alongside Fashion Week regular Cara. One supermodel who didn't work her stuff for designer Karl Lagerfeld was Kate Upton, who took time off from her model duties by sitting in the front row next to Vogue's Grace Coddington.