11/06/2016. London, UK. CATHERINE, DUCHESS OF CAMBRIDGE, PRINCESS CHARLOTTE and PRINCE GEORGE on the balcony of Buckingham Palace, during the Trooping The Colour ceremony in London. This years event is part of a weekend of celebration to mark the 90th birthday of Queen Elizabeth II, who is Britain's longest reigning monarch. Photo credit: Ben Cawthra *** Please Use Credit from Credit Field ***