Actress Michelle Williams is a guest on "Piers Morgan Tonight" at 9pmET, and she talks about playing Marilyn Monroe in the new movie "My Week With Marilyn." "I've never spent this long with a character before," she tells Piers Morgan, reflecting on how emotional she was. "That always moves me, when somebody is bravely fighting against themselves or the outside world, but when there's real bravery involved in the fight."
She also talks about turning 30, being a mom, and her life now: "Patterns have started emerging, and I find that comforting." Watch the full interview tonight, 9pmET/PT. Also on the show: journalist Meredith Vieira.