Demi Lovato says she "learned a lot" from Britney Spears during her time on The X Factor USA, and also revealed the pair's mums have since become good friends. While Britney opted not to come back for this year's series, 'Heart Attack' singer Demi will be back for a second season later on in the year and says sitting on the panel with the 'Criminal' star showed her that fame doesn't have to change you. "What I learned from Britney is that you don't have to change," Demi told MTV News this week. "Her family, we laughed several times, 'cause our families are so similar. "Our mums are super close now," the singer revealed. "And our dads are really similar, she has this southern down-to-earth family. "And she's still a southern down-to-earth girl," Demi explained. "I already knew that you don't have to change in this industry, but even at her level of success being the icon that she is, it was really refreshing."Capitalfm