That is why Prince George’s siblings, Charlotte and Louis, also have titles as princess and prince respectively. Prince Harry and Prince William, their spouses, however, will use royal titles their entire lives, unless they become King. When Diana (Prince William and Prince Harry’s mother) married Prince Charles, her name was Diana, Princess of Wales. For Kate, she will only be Her Royal Highness Catherine, Princess of Wales when Prince William becomes the Prince of Wales after his father moves on to take the throne. Once Prince William becomes King, Kate will become Her Majesty Queen Consort Catherine VI.

Source: Standard Digital March 11, 2021 11:37 UTC