The UK's Royal Navy marked Queen Elizabeth II’s birthday with 21-gun salute.
The queen celebrates her birthday twice.
She is doing so privately at Windsor Castle today, a palace spokesman told CNN and has an "official" public birthday in June, which will be celebrated as part of the Diamond Jubilee.
Ingrid Seward, editor of Majesty magazine told CBS News said the Queen was having a quiet family lunch, and then putting her feet up in the afternoon. "Not very exciting, but for her that is a bit of a relief."
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Her official birthday will take place at Buckingham Palace on June 16, the Associated Press reported.
The Jubilee marks the Queen's 60 years on the throne.
She is traditionally given gun salutes on this day at military bases around the country. Today's main one was fired at Portsmouth Harbor in England, the AP wrote.
Hundreds of people gathered at the Tower of London where the Royal Gibraltar Regiment fired a 62-gun salute, wrote CNN.
Additional salutes took place in Hyde Park and Windsor Great Park.