Well, the stars sure came out at the annual Conde Nast Media Group 5th Anniversary at Fashion Rocks. The show was recorded simultaneously while the National televised Stand Up To Cancer charity event aired. Stars including Beyonce, Mary J. Blige, Mariah, Ashanti, Rihanna, Ciara, Keyshia Cole and many others even performed their Stand Up to Cancer tribute in hopes of raising money for further cancer research and treatments. And as always, in the spirit of fashion week, many stars brought out some of their best style and glamour. Check out the photos. Performances included a duet with Beyonce and Justin Timberlake as well as a tribute to Etta James again by Beyonce, Chris Brown, a duet with Mary and Kid Rock, Rihanna with a sparkling ensemble, Mariah Carey, and Miss Solange herself. The big night at Fashion Rocks will air Tuesday, September 7th on CBS at 9 pm.