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Hilary Duff wasn't always proud of her body. In fact, she was quite unhappy with it when she was a famous teenager.

"I was too thin," the actress told PEOPLE. "That was not a healthy place for me. I was so unhappy. I remember my hands cramping because I wasn't getting enough nutrients."

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"A lot of girls my age were super skinny," she says of her 18-year-old self. "I think it's just as bad now, but it's more normal. It's crazy. I can't be that way. It's not my normal state."

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These days, Hilary has an entirely different mentality — she's a mother to 3-year-old Luca and she's extremely happy with her body, even posting sexy selfies to show it off.

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"Things don't bounce back the way they used to, but I don't need to be 110 lbs," she says of her post-baby body. "I'm a 27-year-old mother. I feel fit and strong and happy."