William, a former pilot for the East Anglia Air Ambulance, flew a helicopter to a London hospital this morning as part of 30th anniversary celebrations for the capital's air ambulance service, for which he is now a patron.
While Middleton typically doesn't make a fuss about her birthday, we've chose to celebrate by sharing some rare photos of one of our favourite royals!
She will no doubt be spending most of the day with Prince Louis, who was born in last April.
The palace wished Middleton a happy birthday on the palace and the royal family's official Twitter accounts.
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Much of that came with Timberwolves star Karl-Anthony Towns on the bench. "I hope he gets healthy soon and comes back stronger". I said: "I don't know what's wrong with him he was just getting ... acting insane for no reason", he said on Twitter.
The charity, which delivers a trauma team to critically injured people in London, is close to William's heart.
During his visit William was given presents for his children, with a small teddy bear each for Charlotte and Louis and a soft toy in the shape of an air ambulance helicopter for George. William - a former search and rescue helicopter pilot in the Royal Air Force - will work as a co-pilot transporting patients to the hospital in emergency situations.
Now a patron of 17 charities, Kate will spend her year focusing on work to help children have the best possible start in life, with a special look at mental health provision.
2012: Her first birthday as a royal (AND ALSO HER 30th), Middleton pre-gamed at the London premiere of War Horse the night prior, and celebrated her big day with friends and family with a dinner in Kensington Palace's private dining room.