LONDON, ENGLAND - FEBRUARY 06: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attends the Guild of Health Writers conference on February 6, 2017 in London, England. (Photo by Danny Martindale/WireImage)
LONDON, ENGLAND - FEBRUARY 06: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attends the Guild of Health Writers conference on February 6, 2017 in London, England. (Photo by Danny Martindale/WireImage)