Rebecca Hall has a role in the new Frost/Nixon movie. I beleive she plays David frost's girlfriend. The movie is based on the play of the same name which in turn is based on the interviews David Frost made with Richard Nixon in the 1970s.
Here's Rebecca at the premiere in New York earlier this week.
Source: http://www.monstersandcritics.com/movies/features/article_1443887.php/In_photos_Frost_Nixon_New_York_Premiere