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HOLLYWOOD, CA - AUGUST 28: Singer Demi Lovato attends the Time Warner Cable 2015 MTV VMA concert to benefit Lifebeat at Avalon on August 28, 2015 in Hollywood, California. (Photo by Rich Polk/Getty Images for MTV)

HOLLYWOOD, CA - AUGUST 28:  Singer Demi Lovato attends the Time Warner Cable 2015 MTV VMA concert to benefit Lifebeat at Avalon on August 28, 2015 in Hollywood, California.  (Photo by Rich Polk/Getty Images for MTV)