Whilst at university, she was actively involved in the drama scene, taking part in productions such as Romeo and Juliet, Lily, and Unravelling the Ribbon at it’s ADC theatre. She graduated last summer.Corrin will soon make her film debut in Misbehaviour, starring Keira Knightley, a historical drama that follows the story of a group of women from the Women’s Liberation Movement seeking to disrupt the 1970 Miss World beauty competition in London.She will also soon appear in US television drama Pennyworth, about the life of butler Alfred Pennyworth.Closer to home, the fledgling actress’s only television credit is an appearance in one episode of Grantchester, in which she played Esther Carter.The advert that launched the search for a young actress to play the young Lady Diana Spencer in The Crown was hardly short of requirements.The successful applicant, it said, should be a “mesmerising new young star with extraordinary range” and “staggeringly talented”.She would need to be able to flirt and play the part of a “social exhibitionist on the world stage” as well as being able to portray the “psychological intensity” of a “desperate and lonely self-harmer at her lowest ebb.” Emma CorrinCredit:Faye Thomas/Eyevine Peter Morgan, The Crown’s creator, said: “Emma is a brilliant talent who immediately captivated us when she came in for the part of Diana Spencer. “As well as having the innocence and beauty of a young Diana, she also has, in abundance, the range and complexity to portray an extraordinary woman who went from anonymous teenager to becoming the most iconic woman of her generation.”Corrin was born in Tunbridge Wells, Kent, and has two younger brothers, Richard, 20 and Jonty, 17.Her South African mother Juliette, is a leading speech and language therapist and her father Christopher, a businessman. The family lives in an impressive detached home with a swimming pool on a private road in Sevenoaks.Corrin attended the Woldingham School in Surrey, a private Catholic day and boarding school for girls at which fees can exceed £12,000 a term.There, she developed a passion for drama, and in 2012, was singled out for her role in an evening of song and dance featuring excerpts from Broadway and West End shows.“Special mention should go to… Emma Corrin’s and Katie Maule’s moving rendition of God on High which received a standing ovation,” the school said in an online review. During her gap year, she took a Shakespeare course at the London academy of music & dramatic art (LAMDA) and spent some time volunteering at a school in Knysna, South Africa before starting at St John’s College, Cambridge, where she read Education with English and Drama, in 2015. Until this week, she was a complete unknown, having only recently graduated from Cambridge. Yet Emma Corrin is destined to become a household name, having been cast in the coveted role of Lady Diana Spencer in lavish Netflix drama The Crown.The 23-year-old, who has thus far graced television screens in just one episode of ITV drama Grantchester, will join the prestigious cast for the fourth season alongside acting royalty including Olivia Colman, who will play the Queen.Corrin said she was “overjoyed, over the moon and incredibly honoured” to have been cast in the role of the future Princess of Wales.”Beyond excited and honored to be joining The Crown for its fourth season,” she said.”I have been glued to the show since the first episode and to think I’m now joining this incredibly talented acting family is just surreal.“Princess Diana was an icon, and her effect on the world remains profound and inspiring. To be given the chance to explore her through Peter Morgan’s writing is the most exceptional opportunity, and I will strive to do her justice!” Diana, Princess of Wales, on her wedding day in 1981Credit:Anwar Hussein/Getty Images Corrin’s Instagram page, on which the first picture was published just six days ago, appears to have been set up in anticipation of the Netflix announcement. Most of the 15 people she is following are her PR representatives or are linked to The Crown.At the family home on Thursday, a friend said her parents were abroad on holiday and revealed they had warned him he “might receive some calls” as the big news broke.The highly anticipated third season of The Crown, which spans the years 1964 to 1976, is expected to be streamed around July of this year while the fourth will likely be released in 2020. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. Lady Diana Spencer, pictured in 1980Credit:Hulton Royals Collection Many applied but only one actress fit the bill. Corrin’s star was about to rise.