Jimmy Fallon September 19, 2017 4:16 am ‘Tonight': Best Friend Challenge With Demi Lovato Jimmy Fallon and Demi Lovato take turns asking questions about each other and guessing the answers. US & World Videos 1:07 Britney Spears spotted as authorities respond to alleged hotel incident 2:15 Prince William and Kate Middleton ‘going through hell,' friend claims (report) 8:01 Lady Gaga's outfit changes, Rihanna's bold looks and more iconic Met Gala moments 2:48 Taylor Swift fans react to Jake Gyllenhaal and Sabrina Carpenter's ‘SNL' appearance 2:05 Whoopi Goldberg reveals who will inherit her fortune