The Duke of Cambridge turns 39 on Monday after performing at a local running event with his two oldest children on Father’s Day.
William is celebrating the last birthday of his 30th year after surprising runners in a race around the Sandringham Estate on Sunday.
Images emerged showing William, Prince George and Princess Charlotte gathering around a microphone and seemingly counting down to the start of the race.
The Duke and Duchess of Cambridge on their wedding day (Lewis Whyld / PA)
George and Charlotte were photographed in shorts and sneakers, while the Duke wore a blue shirt and dark blue chinos.
Brian Cook, who took part in the run and photographed the royal trio, said it was “a nice surprise and kind of you”.
Buckingham Palace posted a birthday message on social media that read, “I wish the Duke of Cambridge a happy birthday today!”
Prince Charles and Camilla wrote: “A very happy birthday to the Duke of Cambridge!”
According to the event’s website, Run Sandringham welcomed hundreds of runners of all abilities and ages to run a half marathon, 3 miles, or community mile with the aim of raising “many thousands for good causes”.
It is assumed that the Duke did not attend the event and was present in a private capacity.
Prince William Arthur Philip Louis of Wales was born second in line to the throne on June 21, 1982 at 9:03 p.m. at St. Mary’s Hospital in Paddington.
He weighed 7 pounds 1 1/2 ounces and was the firstborn son of the Prince and Princess of Wales.
The Duke and Duchess of Cambridge are leaving the Lindo Wing of St. Mary’s Hospital in London with their newborn son Prince George (Dominic Lipinski / PA).
At just nine months old, he accompanied his parents on their six-week official visit to Australia and New Zealand, which marked a break with royal tradition.
His mother Diana, who separated from Charles in 1992, died in a car accident in 1997.
He was only 15 and Harry 12, and the brothers were walking behind the princess’ coffin during a funeral procession through London.
William met Kate Middleton at St Andrews University in Fife, Scotland, and the couple married in 2011 after being together for more than eight years.
On the morning of his wedding, he was made Duke of Cambridge by his grandmother the Queen.
The couple welcomed their first child George – also a future king – in 2013, followed by Charlotte in 2015 and Louis in 2018.