Heidi Montag Rehearses New Song For Miss Universe

'Hills' star will sing just-released 'Body Language,' from a new album due in September.

[artist id="3187707"]Heidi Montag[/artist] is hard at work preparing for the weekend's Miss Universe pageant, where she'll be performing her new song, "Body Language." The pageant -- which will also include performances by [artist id="2583152"]Flo Rida[/artist] and [artist id="1231569"]Kelly Rowland[/artist] -- airs this Sunday at 9 pm ET on NBC.

The song was released last week on iTunes and will be featured on Heidi's upcoming self-titled album, which hits stores on September 29, the same day the new season of "The Hills" premieres.

Heidi's Dance Rehearsal

"I am so excited to perform ... at Miss Universe for my first ever live performance," Montag told People. "This is such a miracle in life and I give thanks to God everyday for this once-in-a-lifetime opportunity."

Photos have also emerged of Heidi in dance rehearsals for the performance. Dressed in gray sweatpants and a pink, belly-baring tank top, the reality-TV star is seen practicing various dance moves by herself and with a group of dancers.

It had been previously reported that [article id="1616808"]Heidi would perform her song, "Turn Ya Head,"[/article] from the album Unleashed, which she just released in July. But it seems that plan has changed in favor of promoting this second release. One plan that has never changed: fulfilling her dream of being a pop star.

"I've wanted to do music since I could talk," [article id="1608306"]Montag told MTV News[/article] earlier this year. "I used to do plays and singing and voice lessons and practice Britney routines when I was, like, 12. This is the biggest dream of my life."