Prince George and Prince Louis' brotherly bond is on display at Trooping the Colour, with the siblings wearing matching red ties.
The young royals sat next to each other in the Ascot Landau carriage opposite their sister, Princess Charlotte, and their mother, Princess Kate.
Prince Louis, seven, could be seen cheekily waving at the crowd as they arrived at the King's Birthday Parade.
One royal fan wrote on social media: "Aww Prince Louis' toothless smile for his big brother."
Prince George and Prince Louis' brotherly bond displayed with sweet matching red ties.
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Another commented: "It looks like Louis is saying something funny to his brother and George is amused and trying to hold his laughter down."
Similarly, someone said: "Happy cuties - Prince George and Prince Louis."
Another royal watcher added: "I love seeing them so happy. Prince Louis is the vibe."
The Princess of Wales, 43, arrived at Trooping the Colour wearing an aquamarine Catherine Walker coat dress.
Prince George smiling while Prince Louis waving at the crowd.
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The "Bria" dress contains the following description: "A deep aquamarine wool coatdress with ivory contrast lapels and cuffs. Also seen here in guards red and black."
Princess Charlotte, 10, matched her mother in a blue dress with a white bow in her hair.
The Princess of Wales wore a matching blue hat by Juliette Botterill and earrings that belonged to the late Queen Elizabeth II.
In addition, Kate accessorised with the Irish Guards Regimental Brooch.
Prince George and Prince Louis could be seen squinting in the sun.
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Prince George and Prince Louis sat beside each other in the crowd.
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Also in attendance at Trooping the Colour today are King Charles, Queen Camilla, the Duke and Duchess of Edinburgh, Princess Anne, Timothy Laurence and the Gloucesters.
Sophie and Edward's children, Lady Louise Windsor and James, Earl of Wessex, are not in attendance at the King's Birthday Parade.
The 21-year-old Louise is currently at university in Scotland, and James will be prepping for his school exams.
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