Which actress played Galadriel in 'The Lord of the Rings' and 'The Hobbit' trilogies?

Cate Blanchett played Galadriel in all six films of the 'Lord of the Rings' and 'The Hobbit' trilogies. Although the character does not appear in the 'The Hobbit' books, Peter Jackson expanded his role for the film adaptation. Blanchett accepted the role because she was a Tolkien fan and for the opportunity to work with special effects, something she had not done before.