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Britain's Queen Elizabeth II (L) and Britain's Prince Philip, Duke of Edinburgh wave to guests at the Patron's Lunch, a special street party outside Buckingham Palace in London on June 12, 2016, as part of the three day celebrations for Queen Elizabeth II's official 90th birthday. Up to 10,000 people are expected to attend the Patron's Lunch along with the monarch, her husband Prince Philip, Prince William and Prince Harry. / AFP / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)

Britain's Queen Elizabeth II (L) and Britain's Prince Philip, Duke of Edinburgh wave to guests at the Patron's Lunch, a special street party outside Buckingham Palace in London on June 12, 2016, as part of the three day celebrations for Queen Elizabeth II's official 90th birthday.
Up to 10,000 people are expected to attend the Patron's Lunch along with the monarch, her husband Prince Philip, Prince William and Prince Harry.
 / AFP / BEN STANSALL        (Photo credit should read BEN STANSALL/AFP/Getty Images)