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LAS VEGAS, NV - MAY 19: (EXCLUSIVE COVERAGE) (L-R) Singers Celine Dion and Madonna attend the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Kevin Mazur/WireImage)

LAS VEGAS, NV - MAY 19:  (EXCLUSIVE COVERAGE) (L-R) Singers Celine Dion and Madonna attend the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada.  (Photo by Kevin Mazur/WireImage)