Isabella Calthorpe is an English actress, former model, society figure, podcast co-host and charity founder. She is also known by her married name, Isabella Branson. Her full birth name is Isabella Amaryllis Charlotte Anstruther-Gough-Calthorpe.
Born on 3 March 1980 in Winchester, Hampshire, she is 46 years old in 2026. She comes from a respected British family connected with aristocracy, property, art and entertainment. Yet her life is not defined only by her family background. She trained as an actress, performed at the National Theatre, worked in West End theatre, and gained roles in British films and television programmes.
Her marriage to Sam Branson brought her into another famous British family. In recent years, she has stepped away from regular screen work and focused on family life, charity projects and her podcast with Cressida Bonas.
Isabella Calthorpe’s Early Life and Age
Isabella Calthorpe was born at the Royal Hampshire County Hospital in Winchester. Her birthday is 3 March 1980, making her 46 in 2026. Close family members and friends have also called her “Bellie”. She spent her early years within a large and well-connected family. Her childhood included access to education, culture, travel and the arts. These experiences helped develop her interest in acting and theatre.
Her family name often brought media attention, but Isabella later created a professional identity through formal training and acting roles. She did not enter the entertainment world without preparation. Her education and theatre work show that she took her chosen career seriously.
Isabella Calthorpe’s Parents and Family Background
Her father is John Austen Anstruther-Gough-Calthorpe, a property developer from the Anstruther-Gough-Calthorpe family. Her mother is Lady Mary-Gaye Curzon, a former model and society figure. Through her father, Isabella is linked to the Anstruther-Gough-Calthorpe baronetcy. Her paternal grandfather was Brigadier Sir Richard Anstruther-Gough-Calthorpe, the second Baronet.
Through her mother, she is connected to the Curzon family. Her maternal grandfather was Edward Curzon, the sixth Earl Howe. These links gave her a recognised place within established British society from an early age. Her parents married in the 1970s but later divorced. Both went on to have other family relationships, giving Isabella a large group of full and half-siblings.
Isabella Calthorpe’s Siblings
Her full siblings include Georgiana Anstruther-Gough-Calthorpe and Jacobi Richard Penn Anstruther-Gough-Calthorpe. Georgiana is an artist, while Jacobi has been connected with property work. Her paternal half-sisters include actress and model Gabriella Wilde, whose birth name is Gabriella Anstruther-Gough-Calthorpe, and Octavia Elsa Anstruther-Gough-Calthorpe.
Her maternal half-sisters include actress and writer Cressida Bonas and the late Pandora Cooper-Key. Cressida gained wider attention through her acting career and her former relationship with Prince Harry. Pandora Cooper-Key died in 2024 after living with cancer. The family has strong ties to acting, modelling, design, property and British society. Isabella’s relatives have followed different paths, though many have worked in creative fields.
Isabella Calthorpe’s Education
Isabella Calthorpe attended Heathfield School in Ascot before studying at Bradfield College. At Bradfield, she became involved in theatre and performed as the chorus leader in a school production of Oedipus Tyrannus in 1997. The play was performed in Ancient Greek and later taken to Greece. Isabella later described the production as an important experience that strengthened her interest in classical culture and performance.
After leaving school, she attended the University of Edinburgh. Her studies focused on Classical Studies, with her education also linked to History of Art. These subjects helped her understand literature, culture, history and storytelling.
Professional Training at LAMDA
Isabella later trained at the London Academy of Music and Dramatic Art, widely known as LAMDA. She studied there from 2003 to 2005. LAMDA has trained many leading British performers. Its courses focus on voice, movement, stage craft and character development. Isabella’s time there prepared her for professional work across theatre, film and television. Her academic background and drama training gave her more than society connections. They provided the skills required to perform in demanding stage productions and screen dramas.
Isabella Calthorpe’s Acting Career
Isabella Calthorpe began gaining professional screen roles during the 2000s. Her work included historical drama, crime, comedy, horror and television drama. Her first recognised film role came in 2004 when she played Lady Jane Bellamy in Stage Beauty. The story takes place in seventeenth-century England, during a time when women were beginning to perform on the professional stage.
In 2006, she played Emily Proctor in an episode of The Inspector Lynley Mysteries called Chinese Walls. The BBC crime drama gave her experience within an established television production. She later appeared in Harley Street as Miranda Cost and played Anna in the comedy film How to Lose Friends & Alienate People. The film featured Simon Pegg and focused on the world of celebrity journalism.
Isabella Calthorpe in Trinity
One of her best-known television roles was Rosalind Gaudain in Trinity. The British drama followed students at a fictional university filled with secrets, social divisions and powerful traditions. Isabella appeared throughout the series in 2009. The role gave her more screen time than many of her earlier television parts and remains one of her most recognised performances. She also appeared in The Prisoner as a character called 765, also known as Wonkers. The production was a modern version of the classic television series and starred Jim Caviezel and Ian McKellen.
Film Work in 13Hrs and Blooded
In 2010, Isabella played Sarah Tyler in the British horror thriller 13Hrs, which was also released under the title Night Wolf. The story follows a family trapped inside a country home while a deadly creature hunts them. Her role was central to the story and required her to lead many of the film’s tense scenes. The cast also included Tom Felton, Gemma Atkinson and Joshua Bowman. In 2011, she played Liv Scott in Blooded, a thriller about a group taken captive by animal-rights activists. She later appeared as Detective Carter in the 2013 crime production Fedz.
Isabella Calthorpe’s Screen Credits
Her recognised film and television work includes:
Stage Beauty as Lady Jane Bellamy
The Inspector Lynley Mysteries as Emily Proctor
Harley Street as Miranda Cost
How to Lose Friends & Alienate People as Anna
Trinity as Rosalind Gaudain
The Prisoner as 765 or Wonkers
13Hrs as Sarah Tyler
Blooded as Liv Scott
Fedz as Detective Carter
Her screen career was most active from 2004 to 2013. She has never made a clear retirement announcement, though no major recent film or television role has been confirmed.
Isabella Calthorpe’s Theatre Career
Theatre was an important part of Isabella’s professional life. In 2006, she played Ethel Voysey in The Voysey Inheritance at the National Theatre. The play was staged at the Lyttelton Theatre and directed by Peter Gill. She also performed as Lisa Houseman in the original London cast of Dirty Dancing at the Aldwych Theatre. The production became a major West End success.
Another stage role was Cecily Cardew in Oscar Wilde’s The Importance of Being Earnest. In 2014, she played India in The Colby Sisters of Pittsburgh, Pennsylvania at the Tricycle Theatre, now called the Kiln Theatre. These roles show that her career extended beyond short television parts. She worked in respected theatres and performed in both classic and modern productions.
Modelling and British Society Life
Alongside acting, Isabella became known as a model and society figure. She attended fashion events, theatre openings, charity gatherings and occasions connected with prominent British families. Her family background made her familiar to society photographers, while her acting career gave her a separate place in entertainment coverage. However, her record as a professional actress is stronger than the available detail about major modelling contracts.
For this reason, she is best described as a former model rather than a full-time fashion model. She never built the highly visible celebrity career followed by some other British society figures.
Isabella Calthorpe and Sam Branson
Isabella Calthorpe married Sam Branson on 6 March 2013. Sam is the son of Virgin Group founder Sir Richard Branson and the late Joan Branson, née Templeman. Their wedding took place at the Branson family’s safari property in South Africa, near Kruger National Park. The ceremony attracted attention because both families were well known within British business and society circles.
Sam Branson has worked as a filmmaker, musician, entrepreneur and charity supporter. He has taken part in environmental campaigns, creative projects and youth-focused work. After marriage, Isabella became formally known as Isabella Branson, although her acting work remains connected to the Calthorpe name.
Are Isabella and Sam Branson Still Married?
No confirmed divorce or current separation has been announced. Sam continues to refer to Isabella as his wife, while official Branson family material describes the couple as living with their two children. Older coverage discussed a period when they spent time apart before marriage. They later reunited and married in 2013. Those older stories should not be confused with their present relationship.
Isabella Calthorpe’s Children
Isabella and Sam have two children. Their daughter, Eva-Deia Branson, was born on 19 February 2015. Their son, Bluey Rafe Richard Branson, was born in January 2017. His middle names include Richard, honouring his grandfather Sir Richard Branson.
The couple protects much of their children’s privacy. Sam sometimes shares family experiences, including countryside trips and time spent in nature. Isabella has maintained a quieter approach to motherhood and family life.
Lessons From Our Mothers Podcast
In 2025, Isabella and Cressida Bonas launched Lessons From Our Mothers. The podcast explores lessons learned from mothers, grandmothers and other maternal figures. The sisters speak with guests about childhood, parenting, grief, personal growth and family relationships. Guests have included well-known people from entertainment, literature, business and royal circles. The podcast gives Isabella a new creative role away from acting. It also allows her to discuss motherhood and family history in a thoughtful and personal format.
Isabella Calthorpe and Big Change
Isabella Calthorpe is a founder of Big Change, a British organisation focused on helping young people thrive. The group supports new ideas in education, mental health, social care and youth opportunity. Its aim is to improve systems that shape young lives rather than focusing only on short-term solutions.
Isabella helped develop Big Change with Sam Branson, Holly Branson and other founding members. Her role connects her with long-term charitable work and social change. She also served as a director of FLIP’S FUND from June 2001 until March 2026. The charity has supported education for children in India, including children from families facing financial hardship.
Isabella Calthorpe and Prince William
Isabella has been connected with Prince William in older media stories. Some accounts claimed that he was interested in her before his marriage to Catherine, Princess of Wales. Neither Isabella nor Prince William has publicly confirmed a formal relationship. The claim should therefore be treated as old media speculation rather than a proven romance. Her links with royal circles are clearer through friendships and family connections. Her half-sister Cressida Bonas previously dated Prince Harry.
Isabella Calthorpe Net Worth and Current Life
Isabella’s personal net worth has not been confirmed by a trusted financial source. Her family background and marriage have led to many online estimates, but these figures lack firm evidence. Sir Richard Branson’s wealth should not be treated as Isabella’s personal fortune. Her private income, property and investments have not been publicly detailed.
Today, Isabella maintains a lower media presence than during her acting years. Her main documented work includes her podcast, charitable involvement and family life.
Conclusion
Isabella Calthorpe has built a life across acting, theatre, modelling, charity and podcasting. Her family name gave her early recognition, but professional training and stage experience helped her form an identity of her own.
She worked at the National Theatre, joined a successful West End production and appeared in films and television dramas. Her marriage to Sam Branson connected two prominent British families, while their two children became a central part of her later life.
Now known as Isabella Branson, she continues her creative and charitable work through Lessons From Our Mothers and Big Change. Her journey shows a steady move from society life and acting towards motherhood, thoughtful conversations and support for young people.