It seems Prince William has been feeling a little nostalgic and had a look back through his old family photo album ... and came across the perfect snap to share before stepping out to launch a texting service aimed at helping first responders yesterday.
In honour of 999 Day in the United Kingdom - a special day commemorating those who work in the emergency services - the Duke of Cambridge took to his official Instagram account to post a photo from 1988 of himself and Prince Harry on a fire truck, as their mother lovingly looked on, in the grounds of Sandringham House.
And precious is an understatement!
Dressed in matching pale blue coats and gold firefighter helmets, the two Princes can be seen posing on the vintage fire truck during a playdate with their cousins, Peter and Zara Phillips.
"The first photograph in this post is of The Duke of Cambridge and The Duke of Sussex and their mother Diana, Princess of Wales, with their cousins Peter Phillips and Zara Tindall in the yard of the Old Fire Station in the grounds of Sandringham House in 1988," the caption reads.
"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," William said in a statement shared on Instagram. "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."
In the photo, the late Princess Diana is wearing a beret over her short blonde locks, while watching her kids and their cousins playing on the truck.
And fans were, of course, overjoyed to see the photo of the "People's Princess".
"Beautiful photo in memorial to a more innocent time, when Diana looked over her boys and all was harmonious in their young world," wrote one follower.
While another person commented on how touching it was to see a photo of Diana on the Kensington Palace Instagram.
"It's the first time I've seen a picture of Prince William and his loving mother together on this profile, and it's quite humble and moving," they said.
Without a doubt, Princess Diana would be incredibly proud of the men her sons have become.
The additional photos in the post are of Prince William speaking with men and women of the police force, as well as from fire and emergency medical services.