Trooping the Colour may be a celebration of King Charles, but his grandchildren, Prince George, Princess Charlotte and Prince Louis, are always a highlight of the event. Following tradition, the royal siblings joined their parents, Prince William and Kate Middleton, as well as the King and Queen Camilla on the balcony of Buckingham Palace to wave to onlookers and watch the flypast of the Royal Air Force's Red Arrows on June 14. The balcony appearance serves as the grand finale of the annual Trooping the Colour celebration in London.