She may only be six years old - but Princess Charlotte already holds a very grand royal title.
Not only is she styled HRH, she is officially known as Princess Charlotte of Cambridge thanks to her parents the Duke and Duchess of Cambridge.
However, it’s likely that her dad Prince William will take the throne making him King and her mum Kate Queen.
And when this happens it seems that Charlotte will be in line for a unique royal title - even grander than her current one.
That title is Princess Royal, which is traditionally bestowed on the eldest daughter of the monarch.
The title was first introduced to mimic the French royal title of Madame Royale back in the 1600s.
The current Princess Royal is the Queen’s only daughter Princess Anne, who was given the title in 1987.
However, royal expert and author of Prince Harry: The Inside Story, Duncan Larcombe, told TownandCountrymag.com: “The title of Princess Royal is traditionally bestowed on the eldest daughter of the monarch.
"It is a title that remains for life, so Princess Charlotte will have to wait at least until the death of the current Princess Royal."
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Meanwhile, despite her royal status, when she attends Thomas' School in Battersea, she is known by a different name - Charlotte Cambridge.
And it stems from his parents' titles - the Duke and Duchess of Cambridge- as kings and princes have historically taken their surnames from their father's titles.
Similarly, her older brother sister Prince George is known as George Cambridge at the school and when he is old enough to attend, it is like Louis will go by Louis Cambridge.
The tradition was also adopted by their dad Prince William, who took the surname Wales in school and in the military thanks to his father's title of Prince of Wales. Prince Harry also opted for the Wales surname.
Officially, Mountbatten-Windsor is the surname for any of the Queen's descendants who need to use it.
It merges the names Windsor - the royal family name - with Mountbatten - the late Prince Philip's surname after he became a naturalised British citizen.
