She was friends with Chelsea Clinton while at Wadham College, Oxford. Not only are they both the same height (5' 9"), they are both fluent in German, and they are both only children.
"Filming Pride & Prejudice (2005) was a joy and made for one of my happiest summers ever. "It could well be that the story brings out the best in people - and it sounds so cheesy, but we really did behave like a family. The girls playing the younger sisters had never been on a film set before and wanted to socialize all the time, so we picnicked, hung out in a beautiful country house and went swimming naked in a lake. It was idyllic."