The Duke of Sussex's relocation the the US has seen him mark many exciting moments in his life - from welcoming his daughter, Princess Lilibet, in June 2021, to various birthdays and anniversaries. However, there is another celebration on the cards as he is turning 40 on 15 September. Before he stepped back from his role, Prince Harry was frequently ranked as one of the favourite members of the Royal Family as he was seen as the cheeky chap who could do no wrong.