DALLAS, TX - DECEMBER 01: Demi Lovato performs in concert during the iHeart Radio 106.1 KISS FM Jingle Ball at the American Airlines Center on December 1, 2015 in Dallas, Texas. (Photo by Gary Miller/Getty Images)
DALLAS, TX - DECEMBER 01: Demi Lovato performs in concert during the iHeart Radio 106.1 KISS FM Jingle Ball at the American Airlines Center on December 1, 2015 in Dallas, Texas. (Photo by Gary Miller/Getty Images)