Like Cher Horowitz before her, Rihanna rocked the red carpet in a custom Alaïa gown. She was one of two best-dressed ladies to surprise us with an unexpected rouge choice (the other was Adele). Yet, the real treat was seeing the Bajan singer in the most mature, glamorous attire we've seen on her in quite some time, proving that while she is the queen of on-the-street style, she can also stun in an airy floor-skimmer, too. No one will be saying, "It's an a-what-a?" to RiRi.
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