Body doubles do more than stunt work and nude scenes!

In the movie If I Stay, adapted from Gayle Forman's popular young adult novel, Chloe Grace Moretz plays a 17-year-old musical prodigy named Mia Hall. But as the actress revealed on E!'s Chelsea Lately Tuesday, she didn't know the first thing about playing the cello. "Don't ruin the movie magic!" she joked.

How did director R. J. Cutler work around Moretz's limitations?

"I tried to learn the cello for seven months," the Atlanta native told host Chelsea Handler, "but then I realized it's much harder than any other instrument, so I couldn't really learn it. So then they just kind of cut my head off and put it onto another girl's body. So I'd be doing scenes and my hands are by my sides and I'm [trying to] act like I'm playing the cello with my head. And they're like, 'Don't move your body!'"

"It looks so good!" Moretz promised. Handler joked, "That's so creepy!"

When audiences see the final version, Moretz said, "It's me—but it's not me."

If I Stay is in theaters Friday.

To learn more about Moretz's next project and her family, watch the video clip now.

Tune in to Chelsea Lately weeknights at 11 p.m. on E!

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