Michelle Williams Unveils Sexy, Toned Body on GQ Cover

 Michael Thompson/GQ

The cover of GQ's February issue says it all: "Who knew Michelle Williams had this body?"

In a racy pictorial for the men's magazine, the 31-year-old Golden Globe winner dresses up as Marilyn Monroe, showing off her surprisingly sexy body in a $130 bra and $60 panties by Stella McCartney. It's a bold move for the actress, who first became famous for her role as bad girl Jen Lindley on Dawson's Creek.

"I wouldn't say that that would be one of my first qualities as a human being — being sexy," Williams says. "And I think because my character on Dawson's Creek was sexy…sexualized…sexual…I saw all the negative attention and connotations that can come along with that. And that those things can keep people from seeing you clearly."

"When you play sexy you're kind of playing just for men. That is something you have to police and turn it on its head," she adds. "I mean, sexuality has been a part of my work, obviously…Blue Valentine…but it's never been sexy. It hasn't been beautiful."

In the GQ interview, Williams also opens up about how her world was turned upside down when ex Heath Ledger passed away in January 2008.

"I really wanted, and I really expected or imagined, that Matilda would have siblings that were close to her age. I wanted that for her. But I couldn't make that happen," Williams explains. "And now that she's 6 that isn't even a possibility anymore. So something that was making me feel impatient, that's been removed. For whatever reason, that's not our luck, or our path."

"You know, as hard as certain things have been for me, it's been harder thinking about how things will be for her. I have a lot of things that she doesn't, and some of what I have I can give to her — the memories that I have, the objects that I have, the physical reminders that I have, the stories."

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!