Marcia Gay Harden Joins \"Fifty Shades\" Cast

(Undated) -- Oscar winner Marcia Gay Harden is joining the cast of "Fifty Shades of Grey." Deadline Hollywood says Harden has signed on to play Christian Grey's adoptive mother, Dr. Grace Trevelyan Grey, in the much-anticipated erotic thriller. Harden is perhaps the most seasoned and recognizable face in the cast of relative newcomers. Irish actor Jamie Dornan plays mysterious leading man Christian Grey. Dakota Johnson plays Christian's seductee and leading lady Anastasia Steele. British pop star Rita Ora has also signed on to play Christian's adopted younger sister Mia. Cameras began rolling on "Fifty Shades of Grey" in Vancouver over the weekend. The movie, based on E.L. James' best selling trilogy, is due out in February 2015.