Princess Beatriz and her husband Edoardo Mapelli Mozzi have named their daughter Sienna Elizabeth.
In a statement, the couple said: “We are all doing well and Wolfie is Sienna’s best older brother.”
Beatriz She is a stepmother to her husband’s son, Wolfie, from a previous relationship.
She tweeted the name of the latest addition to the Royal Family along with a photo of Sienna’s footprints.
Posting pictures of a baby’s feet has become a popular way to celebrate a new son or daughter.
The Duke and Duchess of Sussex followed the trend in 2018 when they posted a photo of their son Archie’s cradled feet.
The princess and real estate mogul Mr Mozzi married in 2020 in a secret lockdown wedding after their planned ceremony was postponed due to the pandemic.
The baby, who is 11th in line to the throne, is the Queen’s 12th great-grandson and the second to be born since the death of the Duke of Edinburgh, following the arrival of the Sussexes’ daughter, Lilibet, in June.
The top 10 spots remain the same, with the new addition entering the line of succession below Beatrice and above Eugenie, who has moved to twelfth.
The Queen’s great-grandchildren are: Savannah and Isla Phillips; Prince George, Princess Charlotte and Prince Louis of Cambridge; Mia, Lena and Lucas Tindall; Archie Mountbatten-Windsor and his sister Lili; August Brooksbank; and the new arrival of Princess Beatrice.
Cambridge children call their great-grandmother Queen Gan-Gan, and the monarch always leaves a small gift in her great-grandchildren’s rooms when they come to stay.
Beatrice is the eldest daughter of the Duke of York and his ex-wife Sarah, Duchess of York, and the baby is their second grandson.
Beatriz’s younger sister, Princess Eugenia, gave birth to a boy named August earlier this year.
Beatrice, a full-time non-royal, is vice president of partnerships and strategy at Afiniti, an artificial intelligence software company.
He has several royal sponsorships, including the Forget Me Not Children’s Hospice, the Teenage Cancer Trust, and the Helen Arkell Dyslexia Center.
In August, she talked about how his own dyslexia was a “gift” because it has offered him different life skills and that his own son or his “extra son” Wolfie would be lucky if he were diagnosed with this disease.