Kate has given birth to her husband Rio s fourth child just days before Christmas
Rio and Kate are already father and stepmother to children Lorenz, 13, Tate, 11, and Tia, nine, from his marriage to his late wife Rebecca Ellison
The couple first shared their happy baby news with a sweet clip in June
In the video she sat down the children to tell them the baby news
Kate has kept fans posted with her baby preparations - and growing baby bump - over the past few months on her Instagram page