The actress was born in Chicago, Illinois but grew up in London, where she was raised from the age of two to 11, before returning to the U.S.
Anderson admits she couldn't shake her accent when she tired of being the "quaint" girl in school and that once upset her, but now she finds it really easy to switch between American and English for film and Tv roles.
She tells BlogTalkRadio.com, "At high school (in America) I had to make a concerted effort to lose the accent. I came to the states a grade-schooler and kids can be cruel and they can ostracise anybody who's different in any way shape or form. At first they thought it (accent) was quaint and then they didn't think it was so quaint anymore!
"There was a period of time when I thought that I could use it when I was a kid to get things that I wanted, whether it was a piece of gum or to befriend people by using it. After a while I started to realise that it wasn't necessarily my friend and I gradually started to lose it.
"But it's near to impossible for me not to fall back into the accent when I'm over in London... It's nearly impossible for me not to slide into the Britishisms when I'm living there.
"I've been asked whether I feel more like a Brit than an American and I don't know what the answer to that questions is. I know that I feel that London is home. I'm very happy with that as my home and I love London as a city and I feel very comfortable there. In terms of identity I'm still a bit baffled."