It wouldn't be one of music's biggest nights without a few rocker-girl looks, right?! (I.e, celebs decked out in leather). Jennifer Hudson made her traditionally ladylike pencil skirt instantly downtown-chic with leather fabric. Lady Gaga looked surprisingly tame in her custom Prabal Gurung stunner. And Coca Rocha proved that supermodels can be totally be rock stars with her skinnies and embellished jacket.