Bookies everywhere are going crazy at the sex of the newborn, with Ladbrokes putting the odds at 8/15 for it to be a girl and 11/8 to be a boy.
Fans have also began gathering around the area of St. Mary's hospital, Paddington with Will and Kate sending out croissants and drinks to them this morning.
How great would it be for Kate to give birth tomorrow, on their 4th wedding anniversary? What an adorable wedding present that would be!
It's like a fairy tale story, so in honour of their anniversary and wishing Kate Middleton good luck, we've put together 12 of her best maternity looks.
Shop her key style essentials below and become a royal dream like Kate.
Photo Credit: Mirror, Popsugar, Express, Instyle
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