Child-turned-adult star opens up on growing up in the spotlight.

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On Monday, US Weekly reported on behalf of the print version of Cosmopolitan that Lizzie McGuire star Hilary Duff dished on what it was like growing up as a famous child star in the April issue.

During her interview with the number-one women's magazine in the country, the actress talked about being in a "serious" relationship at a young and vulnerable age, having bad influences in her life, and what it's like now that she's an adult.

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Duff also talked about how she did a "massive friend cleanse" following the breakup from then-boyfriend, Joel Madden, to get rid of the negativity in her life.

"At 19, I did a massive friend cleanse. That was really hard, to sit down with people and say 'We can't be friends anymore.' They were like 'That's f-ked up; you're a bitch.' But having a good reputation was important to me. That's not to say I didn't screw up and do little naughties here and there," Duff said.

After becoming a child Disney star, the actress had to struggle with society's perception of her as she grew up and tried to shed the younger version of herself.

"I don't have to prove to people that I'm an adult now. I am an adult. It's frustrating to be put in a box, but I never needed to wild out to show that I'm grown-up," she said.

And even as a teenager, Duff was dating older-than-her boyfriend Madden and when asked when she lost her virginity, Duff said:

"I had a 26-year-old boyfriend [from age 16 to 19] so everyone can make their own assumptions about what I was doing."

When asked if she ever had an "eff buddy," Duff revealed: "I've enjoyed myself. I think everyone should have something where you know it's not exactly what you're looking for but you just have a wicked good time. That was freeing for me and a bit of an awakening. It's fun to have a secret."

Tags: Hilary Duff