Jennifer Lopez Performs Dance Medley at American Music Awards

Getty Images

Justin Bieber danced as Jennifer Lopez performed.

Jennifer Lopez kicked off the 2015 American Music Awards by dancing to all the big tunes of the year.

Wearing a skintight bejeweled dress and a multicolored jacket, J.Lo began her performance by singing a slowed-down version of one of her original hits, "Waiting for Tonight," before announcing, "Tonight isn't about me, it's about the music. And this year, the music made me want to dance." She then began dancing to a seven-minute medley of the biggest hits of the year, including "Uptown Funk," "Anaconda," "Flawless," "Can't Feel My Face" and "Bad Blood."

The most delighted audience member during this performance just might have been Justin Bieber, who danced along in his seat, doing the robot while Lopez danced to his "Where Are U Now."