Full show: Taylor Swift I Knew You Were Trouble performance MTV Video Music Awards 2013 Taylor Swift I Knew You Were Trouble performance MTV Video Music Awards 2013 Taylor Swift I Knew You Were Trouble performance MTV Video Music Awards 2013 Taylor Swift I Knew You Were Trouble performance MTV Video Music Awards 2013 Taylor Swift I Knew You Were Trouble performance MTV Video Music Awards 2013 Taylor Swift I Knew You Were Trouble performance MTV Video Music Awards 2013