Prime Minister David Cameron has paid fulsome tribute to the Queen on the day she becomes Britain's longest running monarch, describing her reign as a "golden thread running through three post-war generations".
Speaking in the House of Commons, Mr Cameron said: "I do think it's right that today we should stop and take a moment as a nation to stop and mark this historic milestone."
Her Majesty the Queen inspires us all with her remarkable service, her dignified leadership and the extraordinary grace with which she carries out her duties.
It is truly humbling to comprehend the scale of service that Her Majesty the Queen has given this country. The reign of Queen Elizabeth II has been a golden thread running through three post-war generations.
The Queen is our Queen and we couldn't be more proud of her. She has served this country with unerring grace, dignity and decency. And long may she continue to do so.
Could overseeing the development of the Commonwealth be the Queen's greatest international success?
As Queen Elizabeth II becomes the country's longest reigning monarch, ITV News looks back at her remarkable rule.
Fashion and portrait photographer David Bailey said the Queen has the most recognisable face in the world and a "twinkle in her eye".