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LONDON, UNITED KINGDOM - MARCH 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits the set of 'Downton Abbey' at Ealing Studios on March 12, 2015 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits the set of 'Downton Abbey' at Ealing Studios on March 12, 2015 in London, England. (Photo by Max Mumby/Indigo/Getty Images)