Model Kendall, 17, shared the super-cute photo, with the message "roommates and best friends".
Since giving birth to her first child with boyfriend Kanye West on June 15, Kim Kardashian has been keen to keep her daughter from the public eye... But perhaps proud aunty Kendall couldn't resist sharing this adorable snap with the baby?
In it, a baby's tiny hand can be seen clutching Kendall's perfectly manicured finger.
The picture is similar to one posted by Khloé Kardashian earlier this week, where Khloé can be seen holding hands with baby North, nicknamed Nori.
Kim and Kanye have only released two snaps of baby North; the first picture in August, when Kanye appeared on the finale of Kris Jenner's talk show for an interview.
The second was posted by Kim after her return from Paris Fashion Week earlier this month.
Although Kim has been fiercely protective over her baby daughter, she dared to share a very revealing selfie this week of herself in a white swimsuit.
In it, she shows off her post-pregnancy body in the high-cut costume.
She is said to have lost 30 pounds since giving birth.
Do you believe it's right to keep pictures of North West private? Or would you like to see more of Kim's baby daughter? Tell us below!