In true Kardashian style, the announcement that Kim Kardashian West and hubby Kanye's surrogate went into labour was made during a guest appearance on "The Ellen DeGeneres Show" on Thursday.
It was all very dramatic as Kourtney and her merry brood along with Kim and Kanye's other three children, North, Saint and Chicago, joined momager Kris Jenner on stage.
Kourtney then proceeded to apologise for Kim's absence, adding the her younger sister had to rush to hospital after receiving news of the impending arrival of her fourth child.
Kim, who began going the surrogate route after dealing with a host of issues during her first two pregnancies, eventually took to social media, announcing they the birth of her new son. This is what we know about baby Kimye so far: