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Selena Gomez Was Really Singing At The AMAs

... To A Backing Track

Selena Gomez wasn't lip-syncing during her American Music Awards performance Sunday ... she did what other performers Christina Aguilera, Nick Jonas and Hailee Steinfeld did and used a backing track.

Twitter went off on Selena's first public performance since getting a kidney transplant earlier this summer. Fans called her a "fraud" and accused her of lip-syncing her new single, "Wolves," since she kept her head down and covered her face for most of it.