Alex and Sierra performed an acoustic rendition of Scarecrow on a rooftop and to no surprise it was a flawless.

Alex & Sierra Attend The Teen Choice Awards

The couple was joined by their guitarist, bassist, keyboardist and one more musician hitting a wooden drum. Alex also jammed on his guitar as he sang the lyrics with Sierra.

Scarecrow is the lead single off their upcoming debut, It's About Us, which will be released on Oct. 7.

Alex & Sierra Perform Just Kids At The Beach

Alex and Sierra, who have been touring to support their upcoming album, also recently filmed a new video on Sept. 18.

“Filming a music video from this afternoon until the sun rises tomorrow..........” they wrote on Twitter about the follow-up to their Scarecrow video.

“3pm-7am video shoot.......... complete,” they later added.

Although they've been so busy with work, the season 3 X Factor USA winners recently told Entertainment Tonight how much they love making music together for a living.

"We work really hard, but it's such a fun thing to be doing together," Sierra said. "It'd be really hard to, just as soon as we leave, get in an argument over something 'cause we've just had so much fun."

Fans can pre-order It's About Us now on iTunes.