Demi Lovato wants to get back to the old days ... In the clip, the “Cool for the Summer” hitmaker threw her head back, bent her knees inward, and put her all into a playful performance ...

Demi Devonne Lovato is an American singer, songwriter, and actor. Lovato appeared on the TV show Barney & Friends as a young child, but first gained fame in 2008 for their role as Mitchie Torres ...

Chad Salvador/Variety via Getty Images Demi Lovato says building ... via Getty Images At the screening, Lovato and Lutes, 33, appeared in matching all-black outfits — as Lovato wore a stylish ...