She goes by Catherine or Catherine, Duchess of Cambridge
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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.
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Kate Middleton will be known as Her Royal Highness the Duchess of Cambridge. The Duchess of Cambridge
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Her husband. And she is no longer Kate Middleton but Catherine,
Duchess of Cambridge.
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The newly-weds, Prince William and Princess Catherine, are the
Duke and Duchess of Cambridge