During the event William was given a card to mark his wife's birthday, to which he said: "I did remember this morning - so I was OK".
Kate Middleton is believed to be celebrating her birthday in private with family. William headed to the Royal London Hospital in honor of London's Air Ambulance Charity, for which he was just announced as a patron of their 30th Anniversary Campaign.
She thanked the public for their "lovely messages" as she celebrated.
2011: Newly engaged (and planning the wedding of a lifetime), Kate and William kept her 29th low-key, celebrating at home after returning from friends Sarah Louise Stourton and Harry Aubrey-Fletcher's wedding in Yorkshire.
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Against Rotherham , for example, we played with nine players who didn't play against Liverpool and the nine were a good selection. Without that competition, if we had just one competition to play in, I could play with the same 11 or same 12.
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He arrived in style: William, who worked as an air ambulance pilot for around two years in East Anglia, touched down in one of the London Air Ambulance charity's helicopters.
Royal watchers are well aware of Prince George's love of aircrafts, too, and as such the eldest of the three was gifted a plastic helicopter.
The duchess was born in Reading on 9 January 1982, to Carole and Michael Middleton.
She represented her school playing tennis, hockey and netball during her time there.
The Duchess left the prestigious boarding school in July 2000 to attend St Andrews University where she met her future husband.