Royal favourite Prince William has shared a vintage family photograph featuring his brother Prince Harry and mother Princess Diana.
Kensington Palace is marking 999 Day in the UK, which promotes the efforts of the emergency services, with the picture.
The sweet childhood throwback, taken in 1988, shows William and Harry playing on a fire engine at the Old Fire Station in the grounds of Sandringham House.
The photo also features cousins Peter Phillips and Zara Tindall, while Diana can be seen in the background watching over the children.
Kensington Palace also posted shots of William meeting various workers from the emergency services over the years.
"Today marks #999DayUK, when we celebrate and say thank you to our incredible Police, Fire and Emergency Medical Services and all our specialised emergency services for all that they do to keep us safe," Kensington Palace captioned the pictures.
The Duke of Cambridge, who is scheduled to visit The Fire Fighters Charity at Harcombe House in Devon today, praised the emergency services in a statement ahead of his visit.
"As a society, we owe our wellbeing, and indeed our lives, to the men and women in our emergency services who work tirelessly to protect us in some of the most difficult circumstances," he said.
"It is only fitting that we should recognise the vital role that they play, and pay tribute to the bravery and dedication of those who have made the ultimate sacrifice for their communities."
One royal fan said it was the first picture that had been posted on the Instagram account showing the Duke and his late mother in the same photo.
"It's the first time I've seen a picture of Prince William and his loving mother together on this profile and it is quite humble, and moving (sic)," they wrote in the comments section.
"Congratulations for all his engagements, his family and his people can be proud of the man he became."
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As a society, we owe our wellbeing, and indeed our lives, to the men and women in our emergency services who work tirelessly to protect us in some of the most difficult circumstances.