Styles and his One Direction band mates were riling up the crowd in Brooklyn's Barclays Center prior to presenting the show's first award, Best Pop Video.
With the crowd cheering loudly for the British pop band, the camera then cut to Swift, who was noticeably disgruntled.
The 23-year-old songstress then turned to Gomez and appeared to utter the words, "Shut the f*** up!"
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