Full show: http://watchawardshows.com Taylor Swift I Knew You Were Trouble performance MTV VMA 2013 Taylor Swift I Knew You Were Trouble performance MTV VMA 2013 Taylor Swift I Knew You Were Trouble performance MTV VMA 2013 Taylor Swift I Knew You Were Trouble performance MTV VMA 2013 Taylor Swift I Knew You Were Trouble performance MTV VMA 2013 Taylor Swift I Knew You Were Trouble performance MTV VMA 2013