The age-defying 49-year-old belted out the track from her upcoming movie, "Second Act" hitting theaters in December. Lopez's co-star for the rom-com, Vanessa Hudgens introduced the artist, describing her as "the legend."
Lopez worked the stage in a silver sparkly ensemble with the help of some dancers.
She shared a snippet of her performance and pictures with her more than 80 million Instagram followers.
"We breathed life and energy into #Limitless tonight," Lopez captioned the post, "so grateful for you and happy you’re enjoying the song...something so special happens when we come together...I felt it tonight and I hope you felt it too, love to you all!
"THIS IS ONLY THE BEGINNING!!!" she added.
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Taylor Swift sparkled in a silver dress and thigh highs, while Carrie Underwood showed off her baby bump in a black velvet gown on the red carpet for the American Music Awards. Cardi B wore an ornate, floral ballgown, Jennifer Lopez sizzled in hot pink. (Oct. 9) AP
Prior to taking the stage, Lopez talked about the song written by Sia, telling Access she told the singer-songwriter: "if you get inspired (after seeing the movie), just write me something"
Lopez also spoke to her motivation for wanting a song for the movie, explaining: "People need a feeling that we can make things happen."
