Ariana Grande treats this year's audience to a mash-up of her latest hits including 'Break Free'

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American Music Awards 2014: The 45 MUST-SEE Pictures Feat. One Direction, 5SOS & Taylor Swift #AMAs

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See the full gallery: American Music Awards 2014: The 45 MUST-SEE Pictures Feat. One Direction, 5SOS & Taylor Swift #AMAs