Princess Beatrice, 33, gave birth to Sienna Mapelli Mozzi at Chelsea and Westminster Hospital on September 18. Shortly after Sienna's birth, the Royal Family posted the following update on their website: "Her Royal Highness Princess Beatrice and Mr Edoardo Mapelli Mozzi are delighted to announce the safe arrival of their daughter on Saturday September 18 2021, at 23.42, at the Chelsea and Westminster Hospital, London.

       "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."

       Beatrice and her husband Edoardo revealed the name of their first child almost two weeks after she was born in the west London hospital.

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       According to the Royal Family's most recent update, Sienna is now eleventh in line to the throne.

       Sienna's father, Edoardo Mapelli Mozzi, 37, welcomed his daughter's birth by sharing on Instagram: "Sienna Elizabeth Mapelli Mozzi.

       "Our life together has just begun, and I can't wait to see all the amazing things that awaits us.

       "Feeling so much love and gratitude for my amazing wife, baby Sienna and Wolfie.

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       "These are the days I never want to forget.

       "This week, a friend said to me the sweetest saying….that with every child you grow a whole new heart.

       "A massive thank you to the Midwife and the amazing team at the Chelsea and Westminster Hospital."

       While the newest addition to the Firm is placed above her older cousin August Brooksbank and aunt Princess Eugenie, she lags behind all of Prince William and Prince Harry's children.

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       Following Sienna's birth, she became the Queen's 12th great-grandchild and the fourth to be born in 2021.

       Sienna and Eugenie's son August were joined by Harry and Meghan's daughter Lilibet Diana Mountbatten-Windsor in June and Zara Phillips and Mike Tindall's third child Lucas in March.