The Queen has taken part in a service of thanksgiving at St Paul's Cathedral on the final day of her Diamond Jubilee celebrations.
The day will conclude with a glittering carriage procession, and RAF flypast.
The Queen's consort was absent from her side as she entered the cathedral; Prince Philip remains in hospital with a bladder infection.
In his sermon, the Archbishop of Canterbury paid tribute to the Queen's "lifelong dedication".
On Monday the Queen recorded a message of thanks for the nation's support ahead of a star-studded concert at Buckingham Palace.
The two-minute message, filmed in her private apartments at the palace, will be broadcast at 1800 BST on radio and television in the UK and across the Commonwealth.
Crowds cheered as the Queen and royal family members drove from Buckingham Palace for the service.
They started to build up in the early morning outside St Paul's and Buckingham Palace, which the Queen in her state Bentley, accompanied by one of her ladies in waiting, Diana Marion, The Lady Farnham.
There was a fanfare as the Queen, wearing an mint green outfit of fine silk tulle, embroidered with tiny star-shaped flowers, arrived at St Paul's for the service at 10:30 BST and the crowds chanted "God save the Queen".
Prince Charles, accompanied by the Duchess of Cornwall, the Duke and Duchess of Cambridge and Prince Harry, arrived a little before the Queen in a fleet of cars from Clarence House. The Princess Royal, the Duke of York and the Earl and Countess and Wessex were also in attendance.
Prime Minister David Cameron, who gave a reading, led the large representation from the government, military personnel and members of the royal household, at St Paul's alongside diplomats and foreign leaders.