Tamsin Egerton (born Tamsin Olivia Egerton, 1988) is an English actress and model best known for her roles as Chelsea Parker in the 2007 film St Trinian's, Holly Goodfellow in the 2005 film Keeping Mum and Guinevere in the 2011 TV series Camelot. Egerton began her acting career at age six, following her older sister, Sophia, to a local youth theatre, saying, "The whole reason I'm acting now is because I wanted to be doing what my big sister was doing". A year later, she appeared in a Royal Shakespeare Company musical production of The Secret Garden, playing Mary. Egerton attended Ditcham Park School near Petersfield in Hampshire, where she says she was bullied. She added that she often truanted, preferring to go to modelling shoots; "I played truant all the time. I was modelling so I'd go to shoots and call in sick." After finishing school at 16 with nine A-grade GCSEs, Egerton pursued acting rather than going to sixth form and then university, saying, "At drama school, they like to take you apart and rebuild you but I don't want to change now." Egerton's other film credits include Sarah in Driving Lessons (2006) alongside Rupert Grint and Flora in Knife Edge (2008). She was to appear as Katrina in Eragon, but the scenes which she featured in were removed from the final cut. Egerton starred as Princess Elenora in the TV children's series Sir Gadabout: The Worst Knight in the Land. In 2001, she starred as the "young" Morgaine in the TV miniseries The Mists of Avalon. She has also appeared on stage – in the RSC's musical version of The Secret Garden. In 2009, she appeared in the St Trinian's sequel, St Trinian's II: The Legend of Fritton's Gold. In 2011, she appeared in Chalet Girl alongside Felicity Jones, Ed Westwick and Bill Nighy, playing "Georgie". In her second Arthurian role, Egerton plays Guinevere in the 2011 US Starz adaptation of the Arthurian legend, Camelot. She lived in Hampstead with theatre producer Jamie Hendry. Tamsin and American actor Josh Hartnett acknowledged in 2013 they were in a relationship. A representative for Hartnett said on 2 December 2015 that Hartnett and Egerton's first child had been recently born. The couple had a second child in August 2017. The couple now live in the UK with their 2 children.

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