The Duke and Duchess of Cambridge have three children - Prince George, seven, Princess Charlotte, six, and Prince Louis, three. Following their birth in St Mary's Hospital, the royal parents had to complete the regular process of filling out their children's birth certificate.

       However, unlike many, the Duke and Duchess don't have a regular job title.

       As demonstrated by a photograph of Prince George's birth certificate, William listed his occupation as “Prince of the United Kingdom”.

       Kate Middleton listed her occupation as “Princess of the United Kingdom”.

       Kate, though commonly known as a Duchess, received the Princess title upon marrying Prince William and should be addressed as “Royal Highness”.

       READ MORE:Prince George could leave London this year

       When Kate is in Scotland she is known as the Countess of Strathearn.

       In Northern Ireland, she bears a different title - Lady Carrickfergus - while Prince William holds Baron Carrickfergus.

       This title was gifted to the pair on their wedding day by the Queen.

       Kate Middleton's full title is Princess William of Wales, however, this is rarely used.

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       Before getting engaged to the Duke of Cambridge, Kate worked in retail and marketing.

       She worked with her parents' supply company briefly before becoming an accessories buyer for the clothing brand Jigsaw.

       Now, as a working member of the Royal Family, Kate undertakes royal duties and holds patronage to over 20 charities and military organisations.

       The Duchess of Cambridge's work is mainly focused on children, mental health, sport and art.