LONDON, ENGLAND - FEBRUARY 07: Catherine, Duchess of Cambridge attends the 75th anniversary of the RAF Air Cadets at St Clement Danes Church on February 7, 2016 in London, England. (Photo by Karwai Tang/WireImage)

LONDON, ENGLAND - FEBRUARY 07:  Catherine, Duchess of Cambridge attends the 75th anniversary of the RAF Air Cadets at St Clement Danes Church on February 7, 2016 in London, England.  (Photo by Karwai Tang/WireImage)