Princess Anne poses with mom Queen Elizabeth in 1951.
Duchess Of York with Princess Beatrice on holiday.
Princess Charlotte of Cambridge, Savannah Phillips and Prince George of Cambridge on the balcony of Buckingham Palace during Trooping The Colour 2018 on June 9, 2018.
Duchess Of York pictured with Princess Beatrice in an undated photo.
Princess Beatrice and Princess Eugenie in 1992.
Duke And Duchess of York with their children Princess Beatrice and Princess Eugenie at Royal Windsor Horse Show After Their Official Separation.
Princess Charlotte of Cambridge and Catherine, Duchess of Cambridge depart from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017.
Dressed in a smocked dress, Princess Anne stands next to Prince Charles in an undated photo.
The Duchess of York, with Princess Beatrice and Princess Eugenie, arriving at Corpach, near Fort William, where they boarded the Royal barge, to join 'Britannia'. (Photo by Chris Bacon - PA Images/PA Images via Getty Images)
Britain's Princess Charlotte of Cambridge at Prince Louis of Cambridge's christening on July 9, 2018.
A portrait of Princess Anne taken for her fourth birthday.
Princess Charlotte of Cambridge plays with a polo mallet as she attends the Maserati Royal Charity Polo Trophy at the Beaufort Polo Club on June 10, 2018 in Gloucester, England.