STORY: Westminster Abbey made the announcement on Thursday (April 21), as the queen celebrated her 96th birthday at her Sandringham estate and gun salutes rang out across London and Windsor.
Elizabeth became the queen of Britain and more than a dozen other countries including Canada, Australia and New Zealand after the death of her father King George VI on Feb. 6, 1952.
The queen has largely avoided the public spotlight after spending a night in hospital in October for an unspecified ailment and being ordered to rest. She tested positive for COVID-19 in February and has said she was left very tired.
She has missed events including the Remembrance Sunday gathering and Easter service, but she joined other members of her family and dignitaries at a memorial service for her husband at London's Westminster Abbey last month.