Once upon a time, Kate and William's daughter could only have ruled the country if she didn't have any big brothers.
But it has been confirmed that a law passed last year means their eldest child will rule England - whether it's a boy or a girl.
David Cameron commented :"The idea that a younger son should become monarch instead of an elder daughter simply because he is a man, or that a future monarch can marry someone of any faith except a Catholic - this way of thinking is at odds with the modern countries that we have become."
With the path cleared for a tiny new King or Queen, we want Kate and Will to get making babies as soon as is possible!
Imagine how cute the royal child would look in a tiny crown...what should the first kid be called? Tell us your baby name ideas!
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