The clip starts with the kids standing next to each other, but when Bonde R300's track "Oh Nanana" begins, Caiden immediately scoops up North, who's wearing an all-leather look, and rocks her back and forth in his arms to the beat.
Caiden -- wearing a camo jacket, jeans and white sneakers -- eventually puts North down and the pair rush toward the camera to continue their cute dance.
The sweet video comes just under a year after Caiden -- the 8-year-old son of rapper Consequence -- was rumored to be North's boyfriend. Kim shut down the reports in February, asserting, "[North] doesn't have a boyfriend."
"Like, is that for real? She's 5," Kim added of North's age at the time.
Though they're not dating, Caiden often shares with North and her family on his Instagram.