Kate Middleton won't be Duchess of Cambridge forever as royal ranks set to change Kate Middleton has held her Duchess of Cambridge title for just over a decade after she married Prince William in April 2011. Updated The video will auto-play soon8Cancel Play now Get daily celeb exclusives and behind the scenes house tours direct to your inboxInvalid EmailSomething went wrong, please try again later. Sign up When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice