埃格顿六岁开始了她的演艺生涯，跟随她的姐姐索菲亚去了当地的一家青年剧院，她说;“我现在演戏的全部原因是因为我想做我姐姐正在做的事情”。一年后，她出现在皇家莎士比亚剧团的音乐剧《秘密花园》中，饰演玛丽。

埃格顿的其他电影作品包括与鲁珀特·格林特（Rupert Grint）合作的《驾驶课》（2006）中的莎拉（Sarah）和《刀锋》（2008）中的弗洛拉（Flora）。她在 2005 年的电影《保持妈妈》中饰演霍莉·古德费罗 （Holly Goodfellow） 的角色引发了争议，因为她在 16 岁时赤裸上身。她将在《埃拉贡》中饰演卡特里娜，但她出演的场景从最终剪辑中删除了。

埃格顿在电视儿童剧《加达布爵士：这片土地上最糟糕的骑士》中饰演埃莱诺拉公主。2001年，她在电视迷你剧《阿瓦隆的迷雾》中饰演“年轻”的莫盖恩。她还出现在舞台上 - 在RSC的音乐剧版《秘密花园》中。

2009年，埃格顿出现在圣特里尼安的续集《圣特里尼安II：弗里顿黄金传奇》中。

2010 年，确认埃格顿将在新的美国 Starz 改编的 Camelot 中扮演 Guinevere。由约瑟夫·费因斯、伊娃·格林和杰米·坎贝尔·鲍尔主演。

Egerton started her acting career 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's other film credits include Sarah in Driving Lessons (2006) alongside Rupert Grint, and Flora in Knife Edge (2008). Her role as Holly Goodfellow in the 2005 film Keeping Mum sparked controversy as she appeared topless at the age of 16. 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 mini series The Mists of Avalon. She has also appeared on stage - in the RSC's musical version of The Secret Garden.

In 2009 Egerton appears in the St Trinian's sequel, St. Trinian's II: The Legend of Fritton's Gold.

In 2010 it was confirmed that Egerton will play Guinevere in the new US Starz adaptation of Camelot. Also starring Joseph Fiennes, Eva Green and Jamie Campbell Bower.