According to the BBC'S Peter Hunt, it was Prince William who filled out his son's birth certificate, registering the important document at Kensington Palace Friday morning.
The new baby's official name is His Royal Highness Prince George Alexander Louis of Cambridge, born on July 22 at St. Mary's Hospital in Westminster, London.
Prince William was very diligent in filling out the document for his first born son and third heir to the British throne. The eldest son of Prince Charles listed his occupation as Prince of the United Kingdom and well as his full name, His Royal Highness Prince William Arthur Phillip Louis, Duke of Cambridge. As for his wife, Catherine, her occupation is listed as Princess of the United Kingdom.
While Catherine is not technically a princess until Prince Charles is made king, she can be referred to as a princess, even though she is officially the Duchess of Cambridge.
The document also shows the new father signed the document, as only one parent is needed to register a child's birth certificate in Great Britain.
The BBC's Hunt also noted on Twitter that when Prince William was born in 1982, his mother, Princess Diana, did not have a place on his birth certificate to list her occupation.