In one of them, the Duke of Cambridge is showing smiling with his own father The Prince of Wales, while Kate is featured with her father Michael. A sweet photo released by Kensington Palace shows the Duke of Cambridge with his father at Sandringham estate in Norfolk, where he has been staying with the Duchess of Cambridge, and their children Prince George, Princess Charlotte and Prince Louis.
The image was taken by the Duchess of Cambridge who is understood to be a keen photographer in December 2019.
The other image pictures a young Catherine with her father Michael Middleton smiling and beaming away.
William, who is second in line to the throne, is just one of a number of royals who have celebrated birthdays during lockdown.
The Queen turned 94 and also marked her official birthday, the Duke of Edinburgh turned 99 earlier this month, while Louis turned two in April and Charlotte reached age five in May.
The royals have stayed apart during the pandemic, and are scattered around the country at their various homes.
William, a future king, has kept himself busy during the crisis with royal video calls, and in the past week, stepping out for the re-starting of physical royal engagements – albeit with social distancing as a key element.
Fans of the Duke and Duchess of Cambridge were soon quick to show their love on social media.
One said on Twitter: “Omg these pictures are so lovely!!! Thank you for this surprise.”
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At his first face-to-face meeting with the public in months when he met ambulance crews in Norfolk on Tuesday, he confessed he was looking forward to being able to go to the local pub for a pint when it was allowed.
He also joked: “I’m worried about the waistline of the nation as well, with all the chocolate and cakes.
“I’ve done a lot of baking at home. Chocolate goes down very well.”
Kate has also revealed they have had “ups and downs, probably like lots of families” and she found keeping to a strict regime had helped, but home schooling had been challenging.
In recent years, the duke has focused his work on mental health, particularly trying to break the stigma surrounding men’s mental health and harnessing the power of football to do so.