And now, Heat Magazine are reporting that the half-sisters are planning to give birth on the same day.
Sources have told the publication that momager Kris Jenner is hoping that Kylie and Khloe will deliver on the same day to ensure high viewing figures on their show, Keeping Up With the Kardashians.
It’s also reported that Kylie and Khloe have very different approaches to their birthing plans.
It’s said Kylie "wants a C-section, because she can't stand the idea of all that pain," while Khloe is going more for an "Earth Mother" vibe.
The source also adds: "She wants a natural birth, without even an epidural, and she's requested meditative music to be played."
Kylie is also said to be planning "a flatscreen TV and a snack bar for her friends" at celebrity birthing spot, Cedars-Sinai Hospital.
It's rumoured Kylie and Khloe will finally confirm their pregnancies on their family’s annual Christmas card, following months of silence on the speculation.
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Mother Kris has been sharing poignant pictures – directed by Eli Russell Linnetz – from the family's festive shoot, and her latest offering sees her eldest daughter Kourtney Kardashian and her three kids randomly placed against a white backdrop.
The 62-year-old star has previously shared images of Kim Kardashian West and her children, but is yet to do the same for Khloe, Kylie or Kendall Jenner.