Kim Kardashian says son Saint and daughter Chicago are "inseparable."
The snapshot shows Saint sitting next to his baby sister as they look off-camera. Kardashian is parent to Saint, Chicago and 5-year-old daughter North West with her husband, rapper Kanye West.
"These two are inseparable #Chi #Saint," she captioned the post.
Kardashian told People in July that Saint is "obsessed" with having a younger sister.
"Saint, every time he sees Stormi and True, he's like 'I have a baby! Do you want to see my baby?!' He is so obsessed with having a little sister. It is really, really cute," the star said.
"They are all so good together, but I think Saint is probably most excited about all of the babies," she added.
He said in the cover story that he hopes his children "never lose their confidence to society."