5 Surprising Facts About Princess Beatrice’s Daughter Sienna And Her New Role As Big Sister To Baby Athena

Princess Beatrice’s daughter, Sienna Elizabeth Mapelli Mozzi, has quickly become one of the most intriguing young members of the British Royal Family, primarily due to the intense privacy surrounding her early life. Born on September 18, 2021, Sienna’s world has changed significantly in the last year, especially with the arrival of a new sibling. As of December 2025, the now three-year-old Sienna is navigating a fresh role as a big sister, a detail that has captivated royal watchers eager for a glimpse into the family’s quiet life in the countryside.

The daughter of Princess Beatrice and property tycoon Edoardo Mapelli Mozzi, Sienna is part of a modern, blended royal family unit. Her life, split between the traditions of the monarchy and the relative normalcy of a private Cotswolds home, is a fascinating study in contemporary royal upbringing. This deep dive explores the key biographical details, the significance of her name, and the recent changes that have put her new baby sister, Athena, and older stepbrother, Christopher Woolf, at the heart of her world.

Sienna Elizabeth Mapelli Mozzi: A Complete Royal Biography

Sienna Elizabeth Mapelli Mozzi holds a unique position within the House of Windsor. Her biography is a blend of ancient royal lineage and modern, private family life. She is the first child of Princess Beatrice, Mrs. Edoardo Mapelli Mozzi, and the second grandchild for Prince Andrew, Duke of York, and Sarah Ferguson, Duchess of York.

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• Full Name: Sienna Elizabeth Mapelli Mozzi
• Date of Birth: September 18, 2021
• Place of Birth: Chelsea and Westminster Hospital, London, England
• Parents: Princess Beatrice and Edoardo Mapelli Mozzi
• Siblings: Younger sister, Athena Elizabeth Rose Mapelli Mozzi (b. January 22, 2025)
• Stepson: Christopher Woolf "Wolfie" Mapelli Mozzi (b. 2016)
• Grandparents: Prince Andrew, Duke of York; Sarah Ferguson, Duchess of York; Count Alessandro Mapelli Mozzi; Nicola Burrows
• Great-Grandmother: The late Queen Elizabeth II (Sienna’s middle name is a tribute)
• Position in Line of Succession: 10th in line to the British throne (as of December 2025, following the birth of her sister Athena)
• Title: As the daughter of a Princess who is not a direct descendant of the monarch, Sienna does not hold a royal title, but through her father, she is also a *Contessa* (Countess) or *Nobile Donna* (Noblewoman) of the Italian nobility.

The Blended Family Dynamic: Sienna, Wolfie, and Athena

The family unit that Sienna is growing up in is a prime example of the modern royal family. Her parents, Princess Beatrice and Edoardo Mapelli Mozzi, who married in a private ceremony at the Royal Chapel of All Saints at Royal Lodge in 2020, have consciously prioritized a life away from the intense media spotlight of London.

Sienna’s Role as a Big Sister to Athena Elizabeth Rose

The biggest update in Sienna’s young life came on January 22, 2025, with the birth of her younger sister, Athena Elizabeth Rose Mapelli Mozzi. The arrival of Athena, whose name has Greek roots (meaning 'goddess of wisdom and war'), has made Sienna a big sister. This new dynamic means the two girls share the middle name 'Elizabeth,' a poignant and direct tribute to their beloved great-grandmother, Queen Elizabeth II.

The decision to give both daughters the same middle name highlights the deep respect Princess Beatrice and Edoardo have for the late monarch. This choice is a subtle but powerful way to connect the youngest generation of the family to the legacy of the longest-reigning British sovereign. The family is now a quartet, with Sienna and Athena growing up together in the tranquility of the countryside, a stark contrast to the bustle of St. James's Palace where Beatrice once lived.

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The Bond with Stepson Christopher Woolf "Wolfie"

Sienna’s family life also includes her older stepbrother, Christopher Woolf Mapelli Mozzi, affectionately known as "Wolfie." Wolfie is Edoardo’s son from his previous relationship with architect Dara Huang. Princess Beatrice has always been praised for her warm relationship with Wolfie, integrating him fully into their family life. Wolfie served as the best man and page boy at Beatrice and Edoardo’s wedding, showcasing the strength of their blended family.

Sienna and Wolfie are reportedly close, with the family splitting their time between their Cotswolds residence and London, ensuring Wolfie maintains a strong connection with both his parents. This blended family setup, featuring Sienna, Wolfie, and baby Athena, is a testament to the modern, unconventional approach Princess Beatrice has taken to her private life.

A Private Royal Childhood: Cotswolds Living and Rare Appearances

Unlike some of her royal cousins, Sienna Elizabeth Mapelli Mozzi's early life has been intentionally kept out of the public eye. This desire for privacy is a hallmark of Princess Beatrice's parenting style, allowing her children to enjoy a childhood that is as normal as possible.

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Life in the Cotswolds

The family’s move to a stunning £3.5 million home in the Cotswolds in 2021 was a deliberate choice to seek a quieter, more rural existence. This area is known for its picturesque villages and idyllic countryside, providing a perfect backdrop for a young family. The property reportedly features a ‘party barn’ and extensive grounds, offering ample space for Sienna, Athena, and Wolfie to play and grow away from the paparazzi.

The Cotswolds residence has become the central hub for the family, with Princess Beatrice often spotted enjoying the local community life. This move signifies a shift from the traditional London-centric royal upbringing, emphasizing a focus on nature and family warmth, a value shared by Beatrice’s mother, the Duchess of York.

The Christening and Public Glimpses

In keeping with the theme of privacy, Sienna’s christening was a small, intimate affair. She was baptized in a private ceremony at the historic Chapel Royal, St. James's Palace, in April 2022, when she was seven months old. The event was attended only by close family members, including her grandparents, Prince Andrew and Sarah Ferguson, and her aunt, Princess Eugenie. The details were quietly reported, reinforcing the family's commitment to keeping their children’s milestones personal.

Public appearances by Sienna have been extremely rare. Her first known public outing was at the annual pre-Christmas lunch at Buckingham Palace, a traditional gathering for the extended Royal Family. More recently, there have been reports of Sienna being introduced to royal traditions, such as a morning horse ride in Windsor with her grandfather, Prince Andrew, demonstrating the continuation of the family's deep connection to equestrian pursuits.

As Sienna Elizabeth Mapelli Mozzi continues to grow, her life—alongside her sister Athena and stepbrother Wolfie—will be a quiet blend of her royal heritage, her Italian noble lineage, and the peaceful, private upbringing her parents have carefully curated in the English countryside. Royal fans remain hopeful for more glimpses of the young *Contessa* as she takes on her new role as the older sister in this fascinating modern royal family.