Tamsin Egerton is an English actress and model. Tamsin Egerton is best known for her roles of Chelsea Parker in the 2007 film St Trinian`s, and Holly Goodfellow in Keeping Mum. Tamsin Egerton started her acting career age six, following her older sister, Sophia to a local youth theatre.

A year later, Tamsin Egerton appeared in a Royal Shakespeare Company musical production of The Secret Garden, playing Mary. Her other film credits include Sarah in Driving Lessons alongside Rupert Grint, and Flora in Knife Edge.

Tamsin Egerton role as Holly Goodfellow in the 2005 film Keeping Mum sparked controversy. She was to appear as Katrina in Eragon, but the scenes which she featured in were removed from the final cut.