Kate Middleton is celebrating her 37th birthday this year, but it might be a first for the Duchess as most of her family will not be spending the day with her.
She will probably be marking the occasion with a private event with her close family tonight, but her two older children and husband will not around during the day.
Prince George will be at school, Charlotte will be attending Willocks Nursery School as usual, and Prince William is attending a very important royal engagement.
The Prince will be visiting the Royal London Hospital to attend an event that is marking 30 years of London's Air Ambulance.
As William was a former air ambulance pilot from 2015-2017, while his family was living in Norfolk, he has a vested interest in the event.
Kensington Palace posted about it on Twitter:
Who knows, maybe Kate will prefer to have some peace and quiet on her birthday!
How do you think she will be spending the day?