But similar due dates and shared copies of 'What To Expect When You're Expecting' isn't all the sisters have in common right now. It seems the girls have committed to identical beauty regimes for the duration of their pregnancies, if their latest social media posts are anything to go by.
In a new photo shared on Khloé's Snapchat, the pair look like identical twins with long blonde waves, minimal eye makeup and bold nude lips.
They also shared two videos from their catch up - which appeared to be in aid of their latest collaboration for Kylie Cosmetics.
"Don’t we look like real sisters right now?" Khloe remarked. "We are, like, full-blown twinning!"
Of course, she couldn't help but make a comment about her younger half-sister's ever-changing looks.
"Kylie you’re like a chameleon," she said. "You look just like Kim when you want to and then like me when you’re smart."
In September, the world struggled to keep up as Khloé , Kylie and their sister Kim Kardashian, were all reported to be expecting babies.
While Khloé is expecting with her NBA player boyfriend Tristan Thompson, and Kylie is pregnant to her rapper boyfriend Travis Scott, Kim has confirmed she is expecting her third child with husband Kanye West via surrogate.
"They are looking at it like a unifying experience for them as sisters,” a source told PEOPLE. “Getting pregnant at the same time was totally unplanned but they are really happy about it."
Congratulations to the Kar-Jenner clan on their rapidly expanding brood!