Designer Zac Posen (L) and singer Rihanna pose backstage before the Zac Posen fashion show at Vanderbilt Hall at Grand Central Terminal on February 16, 2015 in New York City.
(February 15, 2015 - Source: Chelsea Lauren/Getty Images North America) see more angles »

Rihanna Cocktail Dress

Rihanna showed her demure side in a burgundy cocktail dress by Zac Posen during the label's fashion show.
Brand: Zac Posen
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