Selena Gomez To Introduce Taylor Swift At Billboard Awards; Christina Aguilera & Pitbull's Surprise Guest Revealed (Access Exclusive!)

Selena Gomez will introduce gal pal Taylor Swift’s performance at Sunday’s Billboard Music Awards, Access Hollywood can exclusively reveal.

An insider tells Access that the superstar – who is a finalist in 11 categories, including Top Artist — will perform her latest hit, “22,” in a fun performance featuring a “Vegas party theme.”

PHOTOS: Selena Gomez

The piece features Cirque du Soleil performers, and Taylor herself will dance during the performance.

Additionally, Christina Aguilera and Pitbull will be joined by a special guest during their performance of “Feel This Moment.”

PHOTOS: Taylor Swift

A-ha frontman Morten Harket will perform the upbeat anthem with the singers (“Feel This Moment” samples A-ha’s famous hit, “Take On Me”).

The 2013 Billboard Music Awards – hosted by Tracy Morgan – will air live on Sunday at 8/7c on ABC.

-- Erin O’Sullivan

Copyright 2014 by NBC Universal, Inc. All rights reserved.
This material may not be published, broadcast, rewritten or redistributed.