This is set to be the busiest few weeks the royal family has seen in a while.
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On Monday morning, the Duchess of Cambridge was admitted to hospital after entering the early stages of labour.
The announcement was made on the official Kensington Palace Twitter account just after 8AM.
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The third royal baby was announced last September.
At the time of writing, reporters were already making the hectic dash to St. Mary's Hospital to set up shop, and the royal family is bracing themselves for even more infant cuteness.
Still, no matter how adorable this new baby is, it's already got some very tough competition.
UPDATE: April 23, 2018, 1:07 p.m. BST The Duchess of Cambridge has given birth to a baby boy and is said to be doing well:
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