In the new issue of Glamour magazine, Fergie opens up about her finance, Josh Duhamel, her meth addiction, and about keeping her body in shape.

GLAMOUR: OK, we have to talk about a very important topic, which is you and Josh. You just got engaged. How did he propose?

FERGIE: I can’t tell! One of my New Year’s resolutions is not to talk about Josh and me so much.

GLAMOUR: Did you imagine you’d be with someone like him?

FERGIE: No, he’s much cuter than I ever could have imagined!… It’s a remarkable time for me because I’ve had such a great run with The Dutchess…and now this. You know, it is so interesting how in this business, the second you start dating they want to know if you’re engaged. The second you’re engaged they want to know when you’re going to be married. The second you’re married, they want to know when you’re having children.

GLAMOUR: Does that get annoying?

FERGIE: Yeah, because you don’t want to ruin it for yourself when it really happens. Now everyone is starting to ask about the wedding and it’s like, “Back off, people!” I want to enjoy this part of it all. Enjoy saying the word fiancé…

GLAMOUR: So how does it feel to call Josh that?

FERGIE: It’s exciting. It’s the first time I’ve ever said that. I keep catching myself! I had never even looked at a wedding magazine, let alone rings and settings. I wasn’t that girl who knew exactly what she wanted. And now I’ve got a stack of wedding magazines.

GLAMOUR: OK, let’s switch topics. Your Wild Orchid bandmates staged an intervention with you when you were 25. You said you faked having bulimia to cover up for the fact that you were using crystal meth.

FERGIE: Yeah. Wasn’t that brilliant? I’m being completely sarcastic!

GLAMOUR: Well, drugs make you lie, right?

FERGIE: Oh, completely–drugs make you lie. But honestly, in the beginning, I liked the fact that at first [the drugs] made me thinner. I did have a secret joy about that. But that lasted for about a month. And then all of a sudden I was too skinny. I lost my curves. My face was very gaunt. So I would go [out to eat and] get practically everything on the menu, and…

GLAMOUR: Was there a time before your intervention when you hit rock bottom?

FERGIE: I had a whole week of rock bottom. At that point I was in a writing mood and very inspired and the words were just flowing out of my pen. I really feel like I was meant to write the song ["Losing My Ground"] because the next day I had the intervention. The Wild Orchid girls read my lyrics and brought them to me. [Some sample lyrics from the song: "Don't know what day it is/What's going on?.../Is this me up in the mirror?/'Cuz I thought it was somebody else/Well, it's a realization, when you find out you don't even wanna look at yourself."]

GLAMOUR: And you started going to therapy right after you got off drugs?

FERGIE: Yeah. It’s been on and off, but I’ll always go. I notice when I don’t go, I start creating bad habits for myself. It’s up to me to put in the effort…. And I definitely watch The Secret a lot. That’s part of my therapy: positive thinking. Really seeing yourself having everything you want, and feeling the emotion of having that. I did that about a Grammy. When The Secret came out, I was saying, “I’m going to win a Grammy.” And I went there with my hypnosis and believing, really feeling what it would be like to have one. And now I have three. I really am a backer of that, the laws of attraction.

GLAMOUR: Do you ever see yourself in young celebs like Britney and Lindsay, who are getting caught doing “stupid things”?

FERGIE: I’ve gone through a lot of the same things. I just don’t have a mug shot.

GLAMOUR: What would you say to those girls?

FERGIE: My advice? Pick someone you admire and watch what they do. For me, it’s my therapist.

GLAMOUR: As an entertainer, your body is a part of your business. Is that stressful, or does it help keep you motivated?

FERGIE: It’s a good thing; I like to keep myself in check. Because everybody goes overboard once in a while. I learned a lot of lessons. A lot. Just by…

GLAMOUR: …eating too much?

FERGIE: Doing everything too much! But I have learned more and more to enjoy my body when I have a few extra pounds on, just being more voluptuous.