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LAS VEGAS, NV - MAY 21: Singer Gwen Stefani and host Vanessa Hudgens attend the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by Chris Polk/BBMA2017/Getty Images for DCP)

LAS VEGAS, NV - MAY 21:  Singer Gwen Stefani and host Vanessa Hudgens attend the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada.  (Photo by Chris Polk/BBMA2017/Getty Images for DCP)