Twilight’ star Ashley Greene poses for covers of this month’s Glamour, with shots done by photographer Matthias Vriens-McGrath.

GLAMOUR: You have a truckload of experience with the Twilight films, but you are also just getting started. It’s kind of funny, right?

ASHLEY GREENE: I still am extremely green in some ways. And so each time I work on a character, it is very exciting, very scary.

GLAMOUR: What about your new movie, Butter? Are you funny in it? I mean, it’s about people who carve butter competitively!

ASHLEY GREENE: I am unintentionally funny in it. Yeah—butter carving in Iowa. It’s a thing there. They make masterpieces.

GLAMOUR: How do you define the rest of your career after being part of this huge Twilight phenomenon so early on?

ASHLEY GREENE: It is difficult because people look at you as that character. I want to play a role of a 24-year-old woman, not 17-year-old girls. So I have picked a couple of films like Butter to show that. And it’s perfectly fine not to do anything for a year if I don’t find the right thing.

GLAMOUR: To have a career like yours, you have to be professional. You have to be in control.

ASHLEY GREENE: You have to try. I am certainly not perfect. I don’t think you should try to be perfect for anyone. When you come to terms with that, then you’re OK.

GLAMOUR: So what about messy Hollywood, like the partying and drugs?

ASHLEY GREENE: I keep to the ground rules. I’m not going to get drunk at a bar. There are younger girls who look up to me. So I do my best not to stray too far.

GLAMOUR: Let’s just talk about life offscreen. Tell me about your charity work.

ASHLEY GREENE: I work with a charity called Donate My Dress. It’s got chapters all over the country where you can donate special-occasion dresses. Prom is a big deal when you’re 15 years old, and it enables girls who don’t have the money to come in and choose something special.