The supermodel shared an adorable video after receiving the kit from the "KUWTK" star on Wednesday showing Jack calling Kylie "mommy" over and over again.
"No, that's Kylie" responds a laughing Rosie in between chuckles.
Her son with Jason Statham can't get enough of Kylie and continued to play with all her skincare products. The billionaire caught wind of little Jack's obsession and shared it on her own IG story writing, "Too Cute."
Of course, besides her billionaire businesses, Kylie stays busy taking care of her own daughter with Travis Scott, Stormi.
As The Blast reported, Kylie recently had a party for her "Kylie Skin" launch and the whole family came to support, including Caitlyn Jenner, who shut down her plan to start her own line after yanking her trademark application.
We'll see if Kylie thinks it's just as cute when Jack comes asking "mommy" for a car when he turns 16.