August 16, 2014 12:24 am Fallon: Demi Lovato Talks “Dateline NBC” Obsession Jimmy Fallon chats with Demi Lovato about her world tour, diving with sharks and her obsession with crime investigation shows. US & World Videos 3:11 Ryan Gosling skips darker film roles because of Eva Mendes and daughters 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