Taylor Swift performs 'I Knew You Were Trouble' at the 40th American Music Awards on November 18, 2012 -- Getty Images

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Taylor Swift performs 'I Knew You Were Trouble' at the 40th American Music Awards on November 18, 2012 -- Getty Images
Taylor Swift performs 'I Knew You Were Trouble' at the 40th American Music Awards on November 18, 2012 -- Getty Images
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