PRINCE Louis’ birth certificate has revealed what Prince William and Kate Middleton do for work.

The birth certificate, which makes official Louis’ previously announced name “His Royal Highness Prince Louis Arthur Charles of Cambridge, lists the usual details such as date and place of birth.

But it is the occupations listed for the Duke and Duchess of Cambridge that is of most interest. The famous mum and dad list their occupations as “prince and princess of the United Kingdom”.

While Kate is most commonly referred to as “Duchess”, she is also a princess after taking on the title “Princess William of Wales” after her marriage in 2011.

Prince Louis was born on Monday, April 23 at the private maternity unit of St Mary’s Hospital, Paddington at 11.01am, weighing 8lb 7oz.

Prince William is taking some time off his official royal duties after the birth of his third child and second son.