The adorable little Princess posed along with mum Kate Middleton, dad Prince William and brothers George and Louis, in their annual Christmas card.
The three-year-old clearly shares the same eyes lips and adorable nose as Diana.
The unexpected holiday portrait was taken at their country home Anmer Hall in Norfolk.
The Instagram caption reads: 'The Duke and Duchess of Cambridge are pleased to share a new photograph of their family.'
'The photograph, taken by Matt Porteous, shows The Duke and Duchess with their three children at Anmer Hall. This photograph features on Their Royal Highnesses’ Christmas card this year.'