British monarch Queen Elizabeth II is celebrating her 91st birthday on Friday. She is the world's longest reigning queen or king and the U.K.'s oldest ever monarch. Queen Elizabeth has been on the British throne for 65 years and 75 days, USA Today noted.
The Queen has had 13 British prime ministers serve during her reign, the first was Winston Churchill. The Queen has met 12 U.S. presidents and is due to host President Trump for a state visit later this year. Queen Elizabeth is a mother of four, grandmother of eight, and great-grandmother to five.
Elizabeth came to the throne in 1952, following the death of her father King George VI.
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