FILE - In this June 28, 2013 file photo, Demi Lovato performs 

FILE - In this June 28, 2013 file photo, Demi Lovato performs on ABC's "Good Morning America,"  in New York. Philadelphia’s Office of City Representatives says Lovato has canceled her appearance at Thursday’s Fourth of July concert because of strep throat. She’s being replaced by 22-year-old country singer Hunter Hays. (Photo by Charles Sykes/Invision/AP, File)
Associated Press
FILE - In this June 28, 2013 file photo, Demi Lovato performs on ABC's "Good Morning America," in New York. Philadelphia’s Office of City Representatives says Lovato has canceled her appearance at Thursday’s Fourth of July concert because of strep throat. She’s being replaced by 22-year-old country singer Hunter Hays. (Photo by Charles Sykes/Invision/AP, File)
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