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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge with their newborn son speak to the media before departing the Lindo Wing of St Mary's Hospital on July 23, 2013 in London, England.
Kate Middleton and Prince William have formally registered the birth of their son Prince George – listing their occupations on the birth register as "prince" and "princess" of the United Kingdom.
Prince William signed the birth register for the third-in-line to the throne at Kensington Palace Friday morning, witnessed by a Registrar from Westminster Register Office.
The newborn was registered as His Royal Highness Prince George Alexander Louis of Cambridge. The certificate lists William as his father and "Catherine Elizabeth" as his mom.
On the couple’s wedding day in April 2011, Queen Elizabeth II gave Prince William the title of the Duke of Cambridge, making Kate the Duchess of Cambridge.
While the Duchess is technically a princess by marriage, she cannot be addressed as Princess Catherine under the royal protocol because the title has not been conferred on her, according to the UK Guardian.
A Kensington Palace spokesman said royal birth certificates conventionally featured the words prince and princess of the United Kingdom, or comparable formulations, as the parents' occupations, according to BBC News.
Prince George, who is third in line to the throne, was born on July 22 at St. Mary's Hospital in London. His name was announced two days later.