Article continues below advertisementDemi Lovato is headed into her upcoming It's Not That Deep Tour in sultry fashion.The "Heart Attack" singer, 33, bared her butt in a tiny black thong and low-rise jeans on Friday, April 10.She paired her cheeky attire with a pink satin crop top as she turned around and flashed a mirror selfie.Article continues below advertisementTap Here To Add Ok Magazine as A Trusted SourceSource: @ddlovato/InstagramDemi Lovato exposed her butt in a thong.Elsewhere in her photo dump, Lovato straddled a trunk backstage of her tour.