Watch: Camilla, Kate, Charlotte, George and Louis arrive for Trooping the Colour
All three Cambridge children have taken part in the Trooping the Colour procession for the first time.
Prince George, eight, Princess Charlotte, seven, and Prince Louis, four, joined their mother, the Duchess of Cambridge, and the Duchess of Cornwall, in the first carriage for the Queen's Platinum Jubilee birthday parade along The Mall in London.
It was known that all five Cambridges would appear on the Buckingham Palace balcony, alongside their grandmother and other members of the Royal Family, for the fly-past but their participation in the royal procession itself came as a surprise to the public.
While travelling from Buckingham Palace to Horse Guards Parade, the Cambridge children appeared to be enjoying the crowds and sense of occasion as they smiled and waved to the crowds.
Louis, sandwiched between his older brother and sister, behaved exceptionally well considering his young age. All three siblings dipped their heads and saluted the colour on their way past so had clearly been well-schooled in how to handle the event ahead of time.
George looked the image of his father in a smart navy blazer and pale blue tie, which fitted perfectly into the colour pallette of the carriage.
Charlotte took on her role at the back of the carriage with aplomb, grinning and waving at the crowd as she went down the Mall in her pale blue dress.
It featured a sweet but subtle bow at the collar but was largely simple in structure, showing her growing into her role as a young public-facing royal.
Read more: 17 times Princess Charlotte stole the show
Louis wore a sailor-style outfit that once belonged to Prince William, often reserved for the royal children and based on the style worn by the Royal Navy. The white top features a large collar with a striped navy edging, and a neckerchief beneath the collar.
As is tradition with the royal children, the youngest boys tend to wear shorts for public occasions.
“Trousers are for older boys and men, whereas shorts on younger boys are one of the silent class markers that we have in England,” etiquette expert William Hanson told Harper's Bazaar.
Two other carriages were involved in the procession. Prince Edward, the Earl of Wessex and his wife Sophie, the Countess of Wessex were in the second carriage along with their two children: the Lady Louise Mountbatten Windsor and The Viscount Severn.
The Duke and Duchess of Gloucester were in the third carriage, accompanied by Vice Admiral Sir Tim Laurence.
Three horses brought up the rear, ridden by Prince Charles, Prince William and Princess Anne.