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."
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."
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.
Copyright 2013 by NBC Universal, Inc. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.