Liv Tyler: 'I've Been on a Diet my Whole Life'

Liv Tyler says she spent years worrying about her weight – until she became a mom.

"I've been a model and actress since I was 14, so I've been on a diet my whole life," the actress, 29, says in the March issue of Glamour. "But once I gave birth, I didn't want to think about myself or feel insecure about my career; I wanted to think about my child. So I stopped worrying about diets."

Still, the mom of 2-year-old Milo (with husband Royston Langdon, 34) says she recently lost 10 pounds without even trying while filming the thriller The Strangers in South Carolina. Filming was also incredibly intense: We were supposed to be out of breath in every scene, so I would run around the stage to achieve that.

I just went to Marc Jacobs and I bought a red dress in a size 4. I've never been a size 4 in my entire life!"

She also weighs in on the debate over super-thin actresses and models. "I definitely think the girls look too skinny now," she says. "I'm friends with Helena Christensen and Linda Evangelista, and I remember Linda telling me that when she was a model [in the '90s], a sample size was a 6 or an 8. Now a sample dress size is a 0 or a 2. That's pretty alarming. There's a lot of pressure on [the models].

I love Liv Tyler, but I'm not a model or actress and I've been on a diet since I was eleven. Big deal what girl hasn't?

I'm already getting tired of this new trend towards "being happy with your size". Bullshit, the U.S. has more obesity, more diabetics, heart attacks and other diseases all caused by over eating. Detroit is the fattest city in the United States. How many HUGE people do you see on a daily basis? I work with people who are so fat they can't breathe, use wheelchairs or crutches to get around. They redid the parking lot and added MORE handicapped spaces and there still aren't enough.

Of course, Liv's sister was on Celebrity Fit Club. She's a mean, gutter-talking heifer. I'm not sure if she's older or younger but looking at her mess growing up, no wonder Liv was always dieting. I wouldn't want to look like the sister either.

So yeah I like Liv but you aren't different from us regular girls.