The father-of-five knows first hand that the early days after a baby is born are often the most frantic, and so he's created a delicious congratulations cake in honour of the Sussexes.
...we're just not sure the royal couple will get to taste it!
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The TV chef posted his well wishes to the Duke and Duchess on his Instagram account, along with a gorgeous 'Royal Roulade' he's created especially for the occasion.
“A massive happy congratulations to the Duke and Duchess of Sussex @sussexroyal on the arrival of Archie Harrison Mountbatten-Windsor!” Jamie said.
“To celebrate I've created this gorgeous Royal Roulade ❤️. It's the timeless classic of strawberries, sponge and fresh vanilla cream, all rolled up into a real showstopper.
“Perfect for a very special afternoon tea! Big love from all the Olivers x #BabySussex I’ve just posted the recipe on jamieoliver.com or just click my bio. big love xx”
"I did actually write and say if they want the food sorted I would bring the best of British and American chefs together to do the catering,” Jamie confessed on Channel 4's Sunday Brunch show.