Prince Harry has used his HRH title on the birth certificate of his daughter Lilibet, it has been revealed.The 36 year old welcomed his second child with 39 year old wife Meghan Markle earlier this month, with the baby's birth certificate now being obtained by TMZ. Lili's birth certificate confirms her full name is Lilbet Diana Mountbatten Windsor, with her father's first name listed as The Duke of Sussex, and his surname as His Royal Highness.