Rihanna and other fashionista celebs - including Beyoncé, Miley Cyrus, Charlize Theron, Mariah Carey, Justin Timberlake, Carrie Underwood and Keith Urban - gathered for the fifth installment of "Fashion Rocks," airing tonight on CBS at 9 p.m. 

ET was first on the red carpet last Friday to bring you all the stars and all the action from the A-list event, held at the renowned Radio City Music Hall in New York City. "Fashion Rocks" will donate its proceeds to the charity Stand Up to Cancer.

The event kicks off Mercedes-Benz Fashion Week in New York and celebrates the relationship between fashion and music. Fashion Week features the world's top designers and many up-and-comers will be showcasing their latest creations for Spring 2009.