Princess Beatrice gave birth to a baby girl at 11.42pm on Saturday at the Chelsea and Westminster Hospital in London, Buckingham Palace has announced.
The newly-arrived daughter is Beatrice's first child with husband Edoardo Mapelli Mozzi, who has a son from a previous relationship.
The Princess, son of Prince Andrew and Sarah Ferguson, tweeted to thank the midwifery team at the London hospital.
"Her Royal Highness Princess Beatrice and Mr Edoardo Mapelli Mozzi are delighted to announce the safe arrival of their daughter on Saturday 18th September 2021, at 23.42, at the Chelsea and Westminster Hospital, London," a statement read.
"The baby weighs 6 pounds and 2 ounces.
"The new baby’s grandparents and great-grandparents have all been informed and are delighted with the news. The family would like to thank all the staff at the hospital for their wonderful care.
"Her Royal Highness and her child are both doing well, and the couple are looking forward to introducing their daughter to her big brother Christopher Woolf."
The baby, who is 11th in line to the throne, is the Queen’s 12th great-grandchild, and the second to be born since the Duke of Edinburgh’s death, following the arrival of the Sussexes’ daughter Lili in June.
The princess and millionaire property tycoon Mr Mapelli Mozzi married in July 2020 in a secret lockdown wedding attended by the Queen and Philip after their planned ceremony was postponed because of the pandemic.
The baby’s arrival has brought joy to the family amid the legal wranglings over the US civil sexual assault lawsuit Andrew is facing. The Duke of York has denied all the allegations.