Today marked one of the most important days of the royal calendar, as the Trooping the Colour parade decorated parts of central London, with swathes of royal fans lining the streets to catch a glimpse.
It was a traditional display of military excellence and prowess, watched on by some of the most senior and distinguished Royal Family members.
The King and Queen, Prince and Princess of Wales and the Duke and Duchess of Edinburgh all stepped out on the iconic Buckingham Palace balcony to watch the RAF's flypast.
It was a day where Catherine received plaudits for a tremendous ensemble, King Charles brilliantly led the parade and Prince Louis left his mischievous mark during the ceremony.
GB News has put together a collection of the best moments below.
Crowds quickly gathered this morning outside Buckingham Palace, as thousands of spectators longed for a snap of the royals
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The 1st Battalion Grenadier Guards were bestowed the honour of trooping their colour at this year's ceremony, as part of the established rotation among the five Regiments of Foot Guards
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Members of the military lined The Mall in the traditional display of British military excellence and showmanship
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The Prince and Princess of Wales arrived by car with their three children: George, 12, Charlotte, 11, and Louis, eight
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The Grenadier Guards on The Mall ahead of the ceremony. King Charles visited them in Aldershot yesterday ahead of today's ceremony
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Sophie, Duchess of Edinburgh, and Vice Admiral Sir Timothy Laurence arrived by carriage. Both the Duke of Edinburgh and the Princess Royal arrived by horse
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Catherine - sat next to a dapper Louis - looked radiant in a bespoke light blue 'Lafayette' coat dress from Catherine Walker, £7,245 cluster earrings, Philip Treacy hat and an Irish Guards brooch, as Catherine is Colonel of the Irish Guards
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Prince William (left) and Prince Edward (right) arrived at the ceremony on horseback
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King Charles, who waved at the crowds, and Queen Camilla arrived shortly after. The Queen wore a red silk crepe Grenadier Guards uniform dress by Fiona Clare, which she paired with a black beret and a white plume. Additionally, she sported the cap badge of the Grenadier Guards by Philip Treacy and the Grenadier Guards brooch
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The King and Queen's carriage was followed by William, Edward and Anne
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Prince George and Princess Charlotte arrived in the Ascot Landau carriage, typically drawn by the renowned Windsor Greys
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A member of the Grenadier Guards holds the Colour flag during the ceremony
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Members Grenadier Guards take part in the King's Birthday Parade
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Prime Minister Sir Keir Starmer sat alongaide Victoria Starmer and watched on the display of military prowess. His Cabinet was rocked merely days ago by the resignations of Defence Secretary John Healey, Armed Forces Minister Al Carns and Private Secretary Pamela Nash
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Kign Charles, sat alongside Catherine, appeared delighted by the parade
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Princess Anne joined brother Prince Edward and nephew Prince William on horseback throughout the parade
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The trio looked commanding and posed a symbol of the unity between the Royal Family and the Armed Forces
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After the ceremony, Catherine left alongside an RAF officer, who escorted her to her carriage to return to Buckingham Palace
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The precessions outside Buckingham Palace and along The Mall were a spectacle for the thousands of fans who made the journey to central London
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The Grenadier Guards on The Mall outside Buckingham Palace before the infamous RAF flypast
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The highlight of the day for many: the RAF flypast. Remarkably, parts of the Red Arrows' flypast are powered by a biofuel called Hydrotreated Vegetable Oil - a renewable source of energy for the trademark red, white and blue trails
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One of the more iconic photos of the day, as the flypast stormed over Buckingham Palace
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Similarly, the Royal Family gave their customary wave to fans on the iconic Buckingham Palace balcony
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But the day wouldn't be without a bit of Louis mischief - here he could be seen pulling faces and leaning out of position to catch a glimpse of the flypast
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