The Mall, London, UK, 9th June 2018. Catherine, Duchess of Cambridge and Camilla, Duchess of Cornwall in their carriage. The Sovereign's birthday is officially celebrated by the ceremony of Trooping the Colour, the Queen's Birthday Parade. Troops from the Household Division, overall 1400 officers and soldiers are on parade, together with two hundred horses; over four hundred musicians from ten bands and corps of drums. The parade route extends from Buckingham Palace along The Mall to Horse Guards Parade, Whitehall and back again.