Hayden Panettiere has no problem showing some skin.

In her new movie, I Love You, Beth Cooper (in theaters July 10), Ms. Panettiere stars as the most popular girl in high school who is the object of the school nerd’s affection. In one scene, with her back to the camera, she drops her towel in the locker room to impress her geeky suitor, played by Paul Rust.

“I was really naked,” the 18-year-old starlet tells me. “I had these little sticky petals on my boobs, but that was about it. My dad calls me such an exhibitionist. He always says, ‘God, even when you were little, you were such an exhibitionist!’ ”

“I’m cool with my body, and I’m cool running around undressed and all that stuff, but there are just certain things that not everyone needs to know, that you need to keep somehow private and personal to you,” she said. “But you never know, you never know. I could be 30 years old and just be like, ‘Screw it—I want to take it all off. I better take a picture of this baby before it all goes.’ “

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