'America's Got Talent' welcomes Selena Gomez, 'Rock of Ages,' special guest

selena-gomez-getty-320.jpg"America's Got Talent" has announced the performers for the first live results show -- Selena Gomez & the Scene and the Tony-award nominated musical "Rock of Ages."

Selena & the Scene will premiere their single "Round & Round," which is the new song off their upcoming album "A Year Without Rain," due out Sept. 21. The cast of "Rock of Ages" will perform a medley of songs from the show with a surprise special guest. Constantine Maroulis of "American Idol" stars as the lead alongside Emily Padgett and James Carpinello in the musical, which garnered five Tony nominations this past year.

"America's Got Talent" starts the Top 48 semifinals Tuesday, July 13 at 9 p.m. ET on NBC. The first results show will air Wednesday, July 14 at 9 p.m. What do you think, "AGT" fans? More excited for Selena or the "Rock of Ages" cast? And who could the special surprise guest be? We're betting on Bret Michaels.

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Photo credit: NBC