They will be joining the previously announced headliner Carrie Underwood. We were sent the following details: Luke Bryan will perform a medley of his hit songs, Demi Lovato will perform songs off her new album Confident and Wiz Khalifa & Charlie Puth will perform their hit "See You Again."

One Direction will be headlining the west coast portion of the broadcast that will be taking place live at the Billboard Hollywood Party in Los Angeles. The broadcast will take place on Thursday, December 31 beginning at 8 p.m. ET/PT on the ABC Television Network. -

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