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LOS ANGELES, CA - AUGUST 30: Recording artist Demi Lovato (center) performs on the Pepsi Stage, during the 2015 MTV Video Music Awards, at The Orpheum Theatre on August 30, 2015 in Los Angeles, California. (Photo by Jason Kempin/MTV1415/Getty Images For MTV)

LOS ANGELES, CA - AUGUST 30:  Recording artist Demi Lovato (center) performs on the Pepsi Stage, during the 2015 MTV Video Music Awards, at The Orpheum Theatre on August 30, 2015 in Los Angeles, California.  (Photo by Jason Kempin/MTV1415/Getty Images For MTV)