Michelle Williams
It only takes one great part change the course of a career and in Michelle Williams' case that part was playing the wife of a gay cowboy in Brokeback Mountain, a role director Ang Lee has admitted he wouldn't even have considered her for had he seen any of the six seasons she'd spent as Jen Lindley on Dawson's Creek. She fell in love with her on-screen husband Heath Ledger while filming the award-winning drama and had a baby, daughter Matilda, with him a year later in October 2005. By March, the couple attended the Oscars with his-and-her acting nominations.
