Queen Elizabeth II becomes Britain's longest-reigning monarch
The Queen is currently 89 years old.
"The Queen will have reigned for 63 years and seven months - calculated at 23,226 days, 16 hours and approximately 30 minutes at about 17:30 BST," BBC reported.
Sharing a photograph of the queen, The British Monarchy posted on its Facebook page: "This photograph of The Queen by the renowned British photographer Mary McCartney has been released to mark the moment Her Majesty becomes the longest reigning British Monarch later today."
UK PM David Cameron tweeted: "Millions of people across Britain will today mark the historic moment when Queen Elizabeth becomes our longest serving monarch."
"Her Majesty has been a rock of stability in a world of constant change, earning admiration for her selfless sense of service & duty," he said.
"It is only right that we should celebrate her extraordinary record, as well as the grace & dignity with which she serves our country," the PM said.
Image: Wikimedia Commons
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