Over the Platinum Jubilee weekend, we saw the Cambridge family out in full force - riding in carriages at Trooping the Colour, making balcony appearances with the Queen and enjoying the concert and pageant.
The youngest, Prince Louis, stole the show with his cheeky personality, dancing and pulling funny faces.
And while many just enjoyed seeing the four-year-old having a fabulous time, some royal fans were struck by just how much of a resemblance the youngster bore to his dad, Prince William.
We initially saw this, when Louis was spotted wearing a sailor outfit that the Duke of Cambridge has previously worn, but as MyLondon reports, an unearthed photo from William's childhood has really highlighted the spitting image.
A snap from 1985 of three-year-old Prince William and his father, Prince Charles, on the royal yacht 'Britannia' has resurfaced online.
Young William appears to be wearing the same white and blue outfit that Louis wore while watching the Jubilee Pageant on Sunday, June 5.
William's hair is cut in a similar style to Louis' and he can be seen with his arms up over his head.
Taking to Twitter, one royal fan pointed out: "Louis looks like Prince William in this photo."
Another agreed, writing: "Prince Louis looks the most like Prince William oh my god."
Prince Louis captured the hearts of the nation over the four-day weekend with his antics.
But while some thought he was misbehaving at royal events, parenting expert Jo Frost, aka 'Supernanny' told The Mirror she wouldn't have put him on the 'naughty step'.
She went on to add that she thought Prince William and Kate Middleton were great "role models" for their little ones.
She said: "For such a young age, Prince Louis did extremely well with Royal protocol on the balcony. There was much to take in and absorb, no doubt beautifully overwhelming.
"[At the Pageant] what we all saw was a four-year-old holding up physically strong to a long day, with sitting and doing lots of things that aren't involved in a typical day for Prince Louis, like most children if they go to a special event.
"I also believe both parents are doing a wonderful job with Prince William being naturally very intuitive.
"I love how they have a good measure on upholding royal duty and protocol whilst parenting and really being very grounded and empathetic. They are great role models."
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