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Brooke Shields is prouder of her body now at 52 than she was when she first modeled for Calvin Klein as a skinny 15-year-old.

“Getting in shape is something I’ve worked really, really hard at,” Shields says in the upcoming issue of Social Life magazine, which hits newsstands Friday. “I’m finally confident and comfortable in my skin.”

Shields, who is modeling for Calvin Klein again after 37 years, said, “I’m happy with who I am and where I am and what I look like. This is me.”

Social Life publisher Justin Mitchell, who just hosted a successful polo event in Southampton, was able to get Shields to pose in Calvin Klein underwear.

“We shouldn’t just see 15-year-old bodies. I don’t want a 15-year-old body. I don’t want to look like a little boy,” Shields said. “I have curves, and I’ve worked on my strength.”

Asked if she would let her two daughters (ages 14 and 11) get into modeling and acting, Shields said she wouldn’t until they finished college.

“It’s a cutthroat and demoralizing business. Plus, they want you when they want you, and you have to be there for auditions and work, and my kids aren’t missing school.”

The Princeton grad said education saved her.

“If I hadn’t had the intellectual piece as my friend, I would have been more devoured by an industry that has no loyalty whatsoever. You do think because you’ve been in the industry all of your life it will be loyal, but it’s the antithesis of that.”