Kelly Clarkson brought out an extremely special guest to help her sing her 2015 hit, "Heartbeat Song," during her latest Las Vegas residency show.

Fans present at the icon's Studio Sessions show at The Colosseum at Caesars Palace in Sin City over the weekend had no idea what they were in store for as they took their seats in the storied venue, ready to hear Clarkson belt out her most popular hits.

The star serenaded the crowd with all of her greatest jams, but that's even the best part. Clarkson welcomed her daughter, 11-year-old River Rose, on stage to perform the Piece by Piece track, and the mother-daughter duo undoubtedly stole the show.

The "Stronger" standout shared a photo from the unforgettable performance on Instagram, shouting out her mini me and revealing that "Heartbeat Song" is her favorite!

"Last night we had a very special guest, my daughter River Rose, joined us for Heartbeat Song 💗 It’s her favorite song!" Clarkson wrote aside a snap of her and River holding microphones. Fans could not get enough of the precious mother-daughter moment and resounded their love for the "Since U Been Gone" songstress and her family in the comment section of the post.

"The duet was absolutely amazing ❤️❤️," one fan remarked.

"She was amazing!! So special to share the stage ❤️," another explained.

For more on Clarkson and her children, River, and Remington, 9, read Kelly Clarkson Reveals Major Pet Peeve That Tests Her 'Emotional Stability'.

See a snap of the mother-daughter duo's heartwarming performance below!

Elvis Duran