Newlyweds William and Kate pose in the Throne Room at Buckingham Palace with his family on our left, her family, the Middletons on our right, and members of the wedding party. On Kate's right include at far right, Kate's sister Philippa, brother James, mother Carole, and father Michael. To the far left of the picture is William's stepmother, Camilla, Duchess of Cornwall, father, Charles, Prince of Wales, brother Prince Harry, and grandparents, seated, Prince Philip and Queen Elizabeth II.
On April 29, 2011 at 8 a.m., the day Prince William of Wales married Kate Middleton, officials at Buckingham Palace announced that, in accordance with royal tradition and on recognition of the day by Queen Elizabeth, William was created Duke of Cambridge, Earl of Strathearn and Baron Carrickfergus. The Queen gave Kate a new princess title: Her Royal Highness Princess William Arthur Philip Louis, Duchess of Cambridge, Countess of Strathearn, Baroness Carrickfergus.
Even though Kate now has an official princess title, she will not and cannot be called Princess Catherine. Why not? Unlike the majority of royal brides, and in contrast to most previous consorts-in-waiting for over 350 years, Catherine does not come from a royal or aristocratic background and therefore has no title of her own. Some of the royals — Princess Margaret, Princess Beatrice and Princess Eugenie, for example — can use the designation because they were born into blue blood clan.
May 6, 1985: Princess Diana holds baby Prince Harry, Prince Charles holds toddler Prince William.
Princess Diana was a blue blood when she married William’s father, Prince Charles. She was never officially declared “Princess Diana.” She styled herself in this fashion, much as the Queen’s mother became “Queen Elizabeth the Queen Mother” when he daughter assumed the throne.
None of this is set in stone, however, as the Queen could make Kate a “Princess of the United Kingdom,” which would then entitle her to be called Princess Catherine.
Could we then call her Princess Kate?
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Lisa's History Room 
Wow! That is very complicated. It’ll be interesting to see what she is referred to as by the public as time goes on.
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I have to dissagree. Catherine won’t be called princess because William isn’t the prince of Wales. His father is. Diana married the prince of Wales and therefor was princess of Wales. When Charles becomes king and William THE prince of Wales then Catherine will be called princess of Wales. William sometimes is called Wiliam of Wales because he has no proper surname. He is of the house of Windsor, but that isn’t a surname.
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I just wanted to add that now that he is Duke of Cambridge William is no longer called prince as he now has a peerage of his own. The title prince came from Charles as William had no title of his own.
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Actually, Prince William is a prince.
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Wilma, please visit http://www.royal.gov.uk/, the official website of the British royal family.
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