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Allison Williams, Allure

CARTER SMITH

Allison Williams looks ready for her next adventure.

The actress, who is gearing up for the lead role in next month's live production of Peter Pan Live! on NBC, poses on the cover of the December issue of Allure and stuns inside the mag's glossy pages in a whimsical, fairytale-inspired photo shoot.

The brunette beauty models a silk Valentino gown with floral embroidery and Giuseppe Zanotti Design suede sandals in one snapshot resembling a shipwrecked scene. In another, the 26-year-old channels the fictional storybook character in a green Alberta Ferreti chiffon lace dress.

Here comes Neverland!

Allison Williams, Allure

CARTER SMITH

In her interview, the multitalented star opens up about her frustrations with negative comments regarding her body since her 2010 YouTube mashup performance of the Mad Men theme song, "A Beautiful Mine" and Nat King Cole's "Nature Boy."

"When I did the Mad Men thing, I was graduating from college—you're college-weight," she explained. "So when we filmed the pilot for Girls and even into that first season, I looked like someone I hadn't looked like for four years."

She continued, "But that's still the way it was set in people's minds, so they're like, 'Oh, my God, you've lost weight.' And I'm like, ‘This is just the way my body is very naturally.' It's a little bit stressful to know that there are a lot of people walking around who think I'm constantly just shaking and depriving myself."

Allison Williams, Allure

CARTER SMITH

Williams also explained the similarities that she shares with her Girls alter ego, Marnie.

"[We] share that push and pull between accepting the way you're wired, that you want your ducks in a row," she says. "And that is desperately uncool when you're in high school and college and in your early 20s. It's supposed to be this time where everyone's sort of living on the edge of uncertainty and fine with it. And that's just not where I feel comfortable."

Read more in the December issue of Allure, which hits newsstands on Nov. 18.