In Pictures: Military pomp on show as Trooping the Colour starts celebrations
The event is the start of four days of festivities honouring the Queen as she marks her Platinum Jubilee.
Historic celebrations to mark the Queen’s 70-year reign have started in central London.
The Trooping the Colour event – also known as the Birthday Parade – was preceded by the traditional carriage procession from Buckingham Palace.
Celebrities and the public are gathering in their millions in tribute to the monarch across the special bank holiday weekend.
Thousands of wellwishers draped in Union flags, party hats and plastic tiaras flocked to central London for the Trooping spectacle.
The young Cambridges and the duchesses’ carriage, known as a barouche, was followed by another carrying the Earl and Countess of Wessex and their children Lady Louise Windsor and Viscount Severn.
George, eight, Charlotte, seven, and three-year-old Louis smiled and waved enthusiastically as they sat in a row, with Louis the youngest in the middle of his older siblings.
The Queen arrived at Buckingham Palace, ready to take a salute from the balcony accompanied by her cousin the Duke of Kent, Colonel of the Scots Guards, when the Household Cavalry Mounted Regiment and the Guards made their way back from the parade ground.