Her parents Prince Harry and Meghan Markle hold royal titles as do her older cousins Prince George, Princess Charlotte and Prince Louis.
But for the Sussex's youngest child Lilibet - she does not have a title or HRH status and is simply known as Lilibet Diana Mountbatten-Windsor.
However, this could all change in the future and she could become a princess with an HRH style - and it's down to a rule set down more than 100 years ago.
