Britney Spears and Rihanna Perform Together at the 2011 Billboard Music Awards
Britney Spears and Rihanna perform onstage during the 2011 Billboard Music Awards at the MGM Grand Garden Arena May 22, 2011 in Las Vegas, Nevada.
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* Celebuzz guys, you are adorable..calling her RiRi. lolz They had fun.* =}