Kelly Clarkson had two very special guests perform with her in Las Vegas!On Friday, the 41-year-old took the stage during The Chemistry residency and was joined onstage by her children, River Rose, 9, and Remington, 7.In a video shared by a fan on TikTok, Clarkson's daughter and son proved they get their talents from their mama as they join her for a performance of «Heartbeat Song.» The clip shows both River and Remy taking their places on opposite sides of their mom, both with mics in hand. River — who wears a pretty blue dress — holds the microphone to her mouth as she sings along with her mother.