Mary-Kate Olsen "More Provocative" Than Sister

Mary-Kate Olsen is "more provocative" than her twin sister Ashley, according to filmmaker Jonathan Levine.

Levine -- who chose Mary-Kate to be in his latest film, The Wackness -- said, "She's the one who's willing to do more extreme stuff. I think she's attracted to more provocative material.

"She just took that role and made it her own - it could've been something she did passively, it could've been something she kind of phoned-in, but she got into it. A lot of the physicality of it, a lot of the way she was moving and talking, that was all her."

He adds, "She's also just cool. In between takes, I found her at the crafts service truck eating grilled cheese and smoking cigarettes talking to the grips."

In the film, which is due for release on August 22, Olsen, 22, plays a drugged-out hippy who shares a passionate kiss in a controversial scene with Sir Ben Kingsley.

Jonathan reveals that the actors didn't make a big deal over it.

"It was cool. He's playing someone who's so immature, and when you meet her (Mary-Kate), she seems really wise, and it was also three in the morning, and so we were just like, 'Ah, lets get it over with'," he recalls.

"They were having fun with it though. They were having a good time."