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LONDON, ENGLAND - MAY 04: Catherine, Duchess of Cambridge, watch detail, visits the 'Vogue 100: A Century Of Style' exhibition at National Portrait Gallery on May 4, 2016 in London, England. The Duchess appears on the cover of the centenary issue in June 2016. (Photo by Karwai Tang/WireImage)

LONDON, ENGLAND - MAY 04:  Catherine, Duchess of Cambridge, watch detail, visits the 'Vogue 100: A Century Of Style' exhibition at National Portrait Gallery on May 4, 2016 in London, England.  The Duchess appears on the cover of the centenary issue in June 2016.  (Photo by Karwai Tang/WireImage)