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LONDON, UNITED KINGDOM - AUGUST 30: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits the Sunken Garden in the grounds of Kensington Palace on August 30, 2017 in London, England. The Sunken Garden has been transformed into a White Garden dedicated to Diana, Princess of Wales mother of The Duke of Cambridge and Prince Harry marking the 20th anniversary of her death. (Photo by Max Mumby/Indigo/Getty Images)