AMA Fashion Face-Off: Katy Perry vs. Rihanna

Chart-topping friends Katy Perry and Rihanna both performed at Sunday's American Music Awards. Who will perform better in a test of style supremacy?
Katy looked adorable as ever on the red carpet, so much so that we can't help wonder if that dress may have helped salvage this rendition of "Firework."
Meanwhile, Rihanna's performance to open the show was a good one, but does her latest style experiment measure up? Vote on the fashion champ below:
Who looked better at the AMAs?

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