The couple were married in a public ceremony at Westminster Abbey in 2011 and was filmed live across the world. Prince William told the UK Press Association about how he proposed to Kate and she confessed that it was a surprise saying:
No, not at all because we were out with friends and things so I really didn’t expect it all. I thought he might have maybe thought about it, but no. It was a total shock when it came, and very excited.
Kate Middleton Trivia: According to Wikipedia upon marriage, Catherine became known as Her Royal Highness The Duchess of Cambridge BUT a fuller version of her title and style is Her Royal Highness The Duchess of Cambridge, Countess of Strathearn and Lady Carrickfergus.