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LONDON, ENGLAND - MARCH 28: Catherine, Duchess of Cambridge arrives at the 2017 Portrait Gala at National Portrait Gallery on March 28, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - MARCH 28:  Catherine, Duchess of Cambridge arrives at the 2017 Portrait Gala at National Portrait Gallery on March 28, 2017 in London, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)