We've watched them share beds, hold each other's hair while driving the porcelain bus, even wax each other's privates. So there's no denying Kim Kardashian, Kourtney Kardashian and Khloé Kardashian Odom share a very special bond.
But sometimes even the tightest pals can get a little, well, insecure. At least that's what it looks like in this clip from Sunday's episode of Kourtney & Kim Take New York.
So, is it just a brief bout of sibling rivalry, or is there something darker and more deep-seated going on? Sound off in the poll: