There's nothing Demi Lovato can't do, including hijack a medley from John Legend and other great singers. The star took on "Hello" during a Lionel Richie tribute at the Grammy Awards, while Richie himself proudly watched from the audience. Not only does she rock it, she full-on slays it. Like, kids might be assuming it's her song from now on. Watch above, check out her red carpet look, and see who all the winners are this year!