The Duke and Duchess of Sussex are currently on parental leave with their newborn child. Lilibet was born on Friday morning in a hospital in Santa Barbara, California. The glad tidings of her arrival were announced on Sunday by the couple’s press secretary.
She is the Queen’s 11th great-grandchild and is eighth in line to the throne.
It means Prince Andrew, who was born as second in line in 1960, moves down to ninth place.
The latest addition to the Sussex family is only the second Royal in line to the throne to have been born in the United States.
She joins her seven-year-old relative Maude Windsor, born in Los Angeles in 2013, in sharing that accolade.
Maude is 51st in line to the British throne and is the daughter of Lord Frederick and Sophie Winkleman.
She now lives in England with her parents and younger sister, Isabella.
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The Queen is said to be “delighted” at the news of the birth of her newest great-grandchild.
In a statement, Buckingham Palace said: “The Queen, the Prince of Wales and the Duchess of Cornwall, and the Duke and Duchess of Cambridge have been informed and are delighted with the news.”
Prime Minister Boris Johnson also sent his “many congratulations” to the couple and Labour leader Sir Keir Starmer welcomed the “wonderful news”.