It's official...Justin Bieber has been added to the lineup of performers at Sunday's American Music Awards. He'll be doing a medley of his hits during the show's finale.

JB has been very busy promoting his new album, Purpose.

Bieber joins an already-loaded AMAs performance lineup that includes host and performer Jennifer Lopez, as well as sets from 5 Seconds of Summer, Ariana Grande, Coldplay, Gwen Stefani, The Weeknd and a Star Wars performance from Pentatonix with a full symphony orchestra. [Billboard]

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