The stars' sister Kim Kardashian gave birth to her first child, daughter North West, last month and the proud aunts love spending as much time as they can with the baby, reported People magazine.
Kourtney has also introduced North to her cousins, Mason, three, and 11-month-old Penelope, her children with partner Scott Disick and all the kids have been getting on great.
North's father Kanye West has been documenting every moment of the newborn's life and is rarely seen without his camera because he doesn't want to miss a minute of her first few weeks in the world.