Rihanna brought an extra dose of sexiness to music's biggest night in an Armani gown at the Grammys. She helped design the racy black dress, which had an open back and slit, with Giorgio Armani. Rihanna's nominated at this evening's show and will also be performing. She'll first take the stage solo and will later be joined by Coldplay. Rihanna will be back in the spotlight later this month for the Brit Awards, which will take place on Feb. 21, the day after her 24th birthday.
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