Spectators cheer, wave flags and take photographs as Britain's Camilla, Duchess of Cornwall (L), Britain's Catherine, Duchess of Cambridge and Britain's Prince Harry (R) travel in a horse-drawn carriage from Buckingham Palace on their way to Horse Guards Parade for the Queen's Birthday Parade, 'Trooping the Colour', in London on June 11, 2016. 
Trooping The Colour and the fly-past are part of a weekend of events to celebrate the Queen's 90th birthday. / AFP / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)