In one snap, George is standing sideways and wearing a camouflage print T-shirt, meanwhile in the second, he's dressed in a dark green polo shirt.
The photo showed a gap-toothed George posing in what appears to be the garden of the Cambridges' Anmer Hall residence in Norfolk, where the family have been staying during lockdown, and is thought to have been taken last month.
Kate's an avid photographer and has been documenting all of her children's birthdays since George was born in July 2013.
George is also an elder brother to younger sister PrinceCharlotte, 5, and Prince Louis, 2. He is third in line to the British throne after his grandfather Prince Charles and father PrinceWilliam.
The Royal spawn aren't photographed very often, but a photo is released every year when they celebrate a birthday. The family is reportedly planning a family birthday party at home.