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NEW YORK, NY - JULY 01: Singer-songwriter Demi Lovato attends Demi Lovato's Debut of her New Single, 'Cool for the Summer,' with Z100 at Gansevoort Park Avenue on July 1, 2015 in New York City. (Photo by Ben Gabbe/Getty Images for Gansevoort Hotel Group)

NEW YORK, NY - JULY 01:  Singer-songwriter Demi Lovato attends Demi Lovato's Debut of her New Single, 'Cool for the Summer,' with Z100 at Gansevoort Park Avenue on July 1, 2015 in New York City.  (Photo by Ben Gabbe/Getty Images for Gansevoort Hotel Group)