Buckingham Palace has confirmed that Archie and Lilibet Mountbatten-Windsor are now styled Prince Archie and Princess Lilibet of Sussex, after an announcement by a spokesperson to the Duke and Duchess of Sussex said:
I can confirm that Princess Lilibet Diana was christened on Friday, March 3 by the Archbishop of Los Angeles, the Rev John Taylor.”
Under the terms of the Letters Patent of 1917:
all children of the sons of the Sovereign have and enjoy the style, title and dignity of prince or princess with the qualification of royal highness.
Archie and Lilibet, who should have been styled with their courtesy titles as the Earl of Dumbarton and Lady Lilibet Mountbatten-Windsor, were entitled to use the Princely Titles upon the accession of their grandfather, King Charles III, last September, though the status of the titles was unclear due to their unused courtesy titles and recent convention regarding the children of the Earl and Countess of Wessex. Prince Archie and Princess Lilibet are the sixth and seventh in the line of Succession.
