Alex Kinsey and Sierra Deaton performed an acoustic rendition of their new song, Just Kids, on a beach and shared the video for their fans via YouTube on Thursday.

Alex & Sierra Hit Studio John Legend, Martin Johnson & Jason Mraz

"We used to come here every once and while to watch the sunrise," Kinsey said before the song began. "We are going to play a song for you now."

The carefree song will appear on It's About Us, their first album since they won X Factor USA last year.

Listen To Alex And Sierra's Little Do You Know

Kinsey, 22, and Deaton, 23, appeared on season 3 of the Fox compeition show and captivated all four judges when they sang an unusual rendition of Britney Spears' Toxic during their audition. They also received standing ovations from the judges - Simon Cowell, Paulina Rubio, Kelly Rowland and Demi Lovato - in the weeks that followed.

The duo - who will go on tour with Colbie Caillat and Train later this month - will release their debut album on Oct. 7. See the tour dates here.

Tags: Alex and Sierra