The expectant Kim revealed her due date, admitting that just like Duchess Kate Middleton, she is also due in July - A year after Kourtney gave birth to baby Penelope.
These sisters are obviously close, but we didn't know exactly how close until Kim revealed that Kourtney suggested they even share breast milk.
Kim mocks Kourtney, "In the old days and maybe we should try this, one sister should baby sit all the kids then I can go out or vice versa and whichever sister is baby sitting should just breastfeed all the kids that are there."
Luckily for the kids, the sisters were just joking around with one another...we think.
Check out their entire interview up above.