Superstar Fashion Battle: Rihanna Vs. Katy Perry!Check this out: two of our time's most successful singers in a fashion duel! Epic! We spotted Katy Perry in her new goth inspired look, wearing this sheer black dress. But did you know Rihanna wore a similar dress back in 2010? She chose the red version of it, and matched it with her old haircolor. But that leads us up to the big question: Who wore it best? Vote, vote, vote!