And North West, aged three, got the chance to have her 19-year-old aunt apply a dark coat of lipstick on her.
The two were attending a birthday party thrown by Kylie and her rapper beau Tyga for his son, King Cairo, who turned four on Sunday.
'Okay, you want black, yes?' the Keeping Up With the Kardashians star asked the daughter of her sister Kim Kardashian, 35, and husband Kanye West, 39.
As the precious little girl squealed with excitement, Kylie agreed and took a snapshot of North in the black gloss.
She humourously captioned the photo: 'What happens at auntie Kylie's stays at auntie Kylie's.'