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WASHINGTON, DC - NOVEMBER 11: Singer Rihanna performs onstage during "The Concert For Valor" at The National Mall on November 11, 2014 in Washington, DC. (Photo by Jeff Kravitz/Getty Images for HBO)

WASHINGTON, DC - NOVEMBER 11:  Singer Rihanna performs onstage during "The Concert For Valor" at The National Mall on November 11, 2014 in Washington, DC.  (Photo by Jeff Kravitz/Getty Images for HBO)