Mary-Kate Olsen was all cleaned up and wearing Stella McCartney for her Elle magazine cover this month. Inside she talks about sibling rivalry, her fashion choices, and what sexy is.

On profit motives complicating or even causing sibling rivalry: “[My twin sister Ashley and I] don’t agree all the time. The way we go about business or designing or making a decision is that we come at it from two completely different angles that at the end of the day, even when we don’t think we’re agreeing with each other, we are agreeing. We’re just getting there in different ways. Unless you’re a twin, you honestly can’t know how close twins can be. There’s such a strength… It stems from love, and it stems from passion. We’re driven people. I do know I can’t work in an office. Ashley, on the other hand, loves going to an office.”

On describing her casual attitude toward fashion: “I don’t know—you’re either on the worst-dressed list or you’ve started a fashion trend. I think there’s a real disconnect between the media’s perception of fashion and the fashion world’s idea of fashion. I don’t know why I wear some of the things I wear. I like wearing crazy things sometimes. I like being playful. Sometimes I feel like I’m playing dress-up and becoming a character. It’s sort of like an art. It can change your mood or the way that people are attracted to you.”

On feeling sexy: “The affirmations you get as a child star are so different from the ones I presume one seeks as a woman. I feel like I can be sexy when I want to be. I think all women are sexy. Some may feel it more than others. I personally think the women who are the most sexy are the women who are truly themselves, whatever that may be.”