How does a royal family member celebrate their birthday?
The Daily Express reports that while William is working, Middleton will celebrate with their three children: George, 5, Charlotte, 3, and Louis, 8 months.
Prince William knows what day it is.
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.
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IAN VOGLER via Getty Images The Duke of Cambridge walks across the helipad after arriving in a red London Air Ambulance at the Royal London Hospital in east London on January 9. They celebrated with the Middleton family at their home (and William even spent the night!). Almost 20-years after the paparazzi-induced death of William's late mother, the prince released a statement via Clarence House encouraging the press to leave his girlfriend alone.
And it's no doubt that this campaign or line of work is close to William's heart, as he operated as an East Anglian Air Ambulance pilot from 2015 to 201.
William also served almost five years as a helicopter pilot with the RAF's Search and Rescue Force.
It's also likely the extended Cambridge family will join in on the celebrations. The first one was a plush helicopter, ideal for William and Kate's newborn.
The Duchess of Cambridge will undertake her first duty of the year on Tuesday 15 January, when she will visit the King Henry's Walk Garden in Islington to see how the project brings people together through gardening and food growing.