Queen Elizabeth will mark 70 glorious years as the monarch of England, Wales, Scotland, and Northern Ireland.
The 95-year-old is expected to begin her day with special greetings from British Prime Minister Boris Johnson.
A Number 10 source said: 'You can expect the Prime Minister to praise Her Majesty's tireless service and historic reign to mark the occasion.'
Mr Johnson told MPs earlier this week: "While it is a moment for national celebration it will be a day of mixed emotions for Her Majesty as the day also marks 70 years since the death of her beloved father, George VI."
He continued: "I know that the whole House will want to join me in thanking Her Majesty for her tireless service."
"We look forward to celebrating her historic reign with a series of national events in June," he said.