FILE - This Nov. 7, 2012 file photo shows Bruno Mars performing during the 2012 Victoria's Secret Fashion Show in New York. Billboard announced Wednesday, April 3, that Mars, Justin Bieber, Taylor Swift and R&B singer Miguel will perform at the Billboard Music Awards on May 19 in Las Vegas. (Photo by Evan Agostini/Invision/AP)

Associated Press
FILE - This Nov. 7, 2012 file photo shows Bruno Mars performing during the 2012 Victoria's Secret Fashion Show in New York. Billboard announced Wednesday, April 3, that Mars, Justin Bieber, Taylor Swift and R&B singer Miguel will perform at the Billboard Music Awards on May 19 in Las Vegas. (Photo by Evan Agostini/Invision/AP)
FILE - This Nov. 7, 2012 file photo shows Bruno Mars performing during the 2012 Victoria's Secret Fashion Show in New York. Billboard announced Wednesday, April 3, that Mars, Justin Bieber, Taylor Swift and R&B singer Miguel will perform at the Billboard Music Awards on May 19 in Las Vegas. (Photo by Evan Agostini/Invision/AP)
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