Singer Rihanna arrives at the 2011 Billboard Music Awards in Las Vegas on Sunday, May 22, 2011. (AP Photo/Dan Steinberg)

Associated Press
Singer Rihanna arrives at the 2011 Billboard Music Awards in Las Vegas on Sunday, May 22, 2011. (AP Photo/Dan Steinberg)
Singer Rihanna arrives at the 2011 Billboard Music Awards in Las Vegas on Sunday, May 22, 2011.
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