London, England, 10th, March, 1959, H,R,H, Princess Margaret wears a sparkling smile and jewellery as she arrives with the Queen Mother for a Royal Ballet Benevolent Fund Gala at the Royal Opera House, Covent Garden [Getty Images]

London, England, 10th, March, 1959, H,R,H, Princess Margaret wears a sparkling smile and jewellery as she arrives with the Queen Mother for a Royal Ballet Benevolent Fund Gala at the Royal Opera House, Covent Garden (Photo by Popperfoto via Getty Images/Getty Images) — see more

London, England, 10th, March, 1959, H,R,H, Princess Margaret wears a sparkling smile and jewellery as she arrives with the Queen Mother for a Royal Ballet Benevolent Fund Gala at the Royal Opera House, Covent Garden (Photo by Popperfoto via Getty Images/Getty Images)

Queen Elizabeth, The Queen Mother, leaving the Victoria League Gala concert at the Royal Festival Hall in London on 25th October 1960. (Photo by Ray Bellisario/Popperfoto via Getty Images/Getty Images) — see more

Queen Elizabeth, The Queen Mother, leaving the Victoria League Gala concert at the Royal Festival Hall in London on 25th October 1960. (Photo by Ray Bellisario/Popperfoto via Getty Images/Getty Images)

LONDON, UNITED KINGDOM - APRIL 21: Queen Mother At Covent Garden For The Queen's 60th Birthday Celebrations. (Photo by Tim Graham Photo Library via Getty Images) — see more

LONDON, UNITED KINGDOM - APRIL 21: Queen Mother At Covent Garden For The Queen's 60th Birthday Celebrations. (Photo by Tim Graham Photo Library via Getty Images)