The Queen's official birthday is set to be marked today by a Trooping the Colour parade held in her honour.
Featuring almost 1,500 soldiers and officers on parade, as well as 300 horses, the parade will take place in Horse Guards Parade in Whitehall and will be followed by an RAF fly-past that the Royal family will view from Buckingham Palace's balcony.
The Queen and the Duke of Edinburgh are expected to arrive in a vintage carriage from Buckingham Palace, having travelled along The Mall to Horse Guards Parade and separate carriages will carry other members of the Royal Family including the Duchess of Cambridge and Prince Harry.
It is also widely anticipated that Princess Charlotte could make her first appearance on Buckingham Palace's balcony, alongside her family, as they mark her great-grandmother's milestone birthday.
The parade is part of a weekend of celebrations marking the Queen's 90th continues which kicked off yesterday with a national service of thanksgiving for the monarch's life at St Paul's Cathedral.
Following today's military themed extravaganza the Queen will continue the celebrations on Sunday as an informal Patron's Lunch street party for 10,000 will be held in The Mall.