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Queen Elizabeth II with the Duke and Duchess of York, the Prince and Princess of Wales, Princess Margaret and the Queen Mother, outside Clarence House in London, for the Queen Mother's 86th birthday, 4th August 1986. (Photo by Tim Graham/Getty Images)

Queen Elizabeth II with the Duke and Duchess of York, the Prince and Princess of Wales, Princess Margaret and the Queen Mother, outside Clarence House in London, for the Queen Mother's 86th birthday, 4th August 1986. (Photo by Tim Graham/Getty Images)