The 22-year-old 'Come and Get It' hitmaker emotionally delivered the lyrics of her song before a star-studded audience consisting of her best friend Taylor Swift, host Pitbull, Jennifer Lopez, among others, reported Us magazine.
The audio of Gomez's teary, pre-recorded phone conversation, as previously heard in the music video of the single, played as Gomez closed her eyes in preparation for her solo.
"When I was on stage and I was thinking of... I know him though, and I know that I know his heart, and I know what he wouldn't do to hurt me," she was heard saying in the audio.
The singer's dramatic live performance also included equally emotional visuals thanks to a state-of-the-art screen behind her projecting a giant moon, lightning storm, a weeping woman, and wings.
As the performance ended, Gomez's eyes welled up with tears and she began crying.