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LONDON - APRIL 21: Queen Elizabeth II celebrates her sixieth birthday on April 21, 1986 at Buckingham Palace in London. The Queen was joined on the balcony of the palace by Prince Philip (R), Prince Andrew and his wife Sarah, Duchess of York, as they listened to thousands of children singing. (Photo by David Levenson/Getty Images)

LONDON - APRIL 21:  Queen Elizabeth II celebrates her sixieth birthday on April 21, 1986 at Buckingham Palace in London. The Queen was joined on the balcony of the palace by Prince Philip (R), Prince Andrew and his wife Sarah, Duchess of York, as they listened to thousands of children singing.  (Photo by David Levenson/Getty Images)