Demi Lovato is known for her insane vocals. On the Tonight Show Starring Jimmy Fallon this weekend, she showed off her range of musical impressions including Cher singing 'Bingo Was His Name-O', Fetty Wap doing 'Twinkle Twinkle Little Star', and a riff-filled rendition of 'Spongebob Squarepants' in the style of Christina Aguilera.