Yesterday, the Duchess of Cambridge turned 37.

The day which we're sure was filled with love, family and jewellery, was however, missing one key player, her husband, Prince William. While out for the day on royal duties, the Prince of Cambridge spent the greater part of his morning visiting London's Air Ambulance Charity at The Royal London Hospital. Having just been given the role "Patron of the London Air Ambulance Charity's 30th Anniversary Campaign", William spent time meeting the staff and first responders as well as patients of the hospital. Making sure Kate was thought about on the day, the staff at the hospital gave William a card to give to the duchess, which was made by a group of children. Receiving the card, William hilariously added that he was too, off the hook, because he remembered it was Kate's birthday that morning. "Well done for remembering. I did remember this morning, so that was ok,” he said.

William accepting a card at @LDNairamb for wife Kate on her birthday: “Well done for remembering. I did remember this morning, so that was ok.” pic.twitter.com/OcMgHc4sJp

— Emily Nash (@emynash) January 9, 2019

For the second half of his day yesterday, It is expected that Prince William spent it with Kate and their children. With no royal events or outings pencilled in, it's rumoured that the Cambridges had a relaxed evening at home - cute.