Informally it is Catherine Elizabeth Windsor.
Formally it is Her Royal Highness, The Duchess of Cambridge, in Scotland Her Royal Highness The Countess of Strathearn. Her full title being, at present, Her Royal Highness The Duchess of Cambridge, Countess of Strathearn and Lady Carrickfergus.
Her maiden name is Middleton, but she is actually refered to as HRH The Duchess of Cambridge.
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Duchess Catherine of Cambridge.
The Duke Of Cambridge is currently married to Catherine, Duchess of Cambridge. The duchess' full name given by her parents at birth was Catherine Elizabeth Middleton.
CanadaTthe Duke and Duchess of Cambridge's first Commonwealth Tour was to Canada, from 30th June to 10 July, 2011
Kate Middleton will be known as Her Royal Highness the Duchess of Cambridge.The Duchess of Cambridge
The newly-weds, Prince William and Princess Catherine, are the Duke and Duchess of Cambridge
Catherine Elizabeth Middleton. She is now the Duchess of Cambridge.
The Duchess of Cambridge's wedding dress was designed by Alexander McQueen's Sarah Burton.
His Royal Highness Prince William of Wales, Duke of Cambridge and Her Royal Highness Catherine, Duchess of Cambridge
Her full name is Catherine Elizabeth Mountbatten-Windsor, and her title is Catherine, Duchess of Cambridge.
There are several remaining duchess. The duchess of Kent, Cambridge, Cornwall, York, etc
These are titles bestowed upon members of the royal family in honor of the city of Cambridge in England. Currently Prince William has the title Duke of Cambridge, and his wife Catherine is Duchess of Cambridge.
Catherine 'Kate' Middleton's royal name is Catherine, Duchess of Cambridge ever since she married Prince William, Duke of Cambridge, on April 29th, 2011 at Westminster Abbey in London, England.