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The Duke and Duchess of Sussex's daughter has been christened at the couple's California home.
Princess Lilibet Diana, who was born to Prince Harry and Meghan in June 2021, was christened on Friday.
Although she was not a princess at birth, because she was not a granddaughter of the monarch, she gained the right to that title when King Charles acceded to the throne.
The announcement is the first time she has been publicly called a princess.
Buckingham Palace has said the royal website will "be updated in due course" to reflect the title.
Lilibet is the second child of Harry and Meghan, who relocated to the US after stepping down as working royals in 2020. Their son Archie was born in May 2019.
The BBC understands members of the Royal Family were invited to the christening.
The rules governing the titles of royal children were set out by King George V in 1917.
As the children of the son of a sovereign, Archie and Lilibet are automatically entitled to be called prince and princess.
Earlier this week, it emerged that Harry and Meghan were weighing up whether or not to travel to the UK for the King and Queen Consort's coronation.
A statement issued on behalf of the couple said Harry had been contacted about the event on 6 May by the King's private office via email.
The BBC understands some prospective guests are being asked to save the date ahead of official invitations to be sent later.
Buckingham Palace has declined to comment on the guestlist.