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Jennifer Lopez is showing off her body like never before in her new thriller The Boy Next Door.

In the film, she plays a high school teacher being terrorized at home and work by a much younger guy (Ryan Guzman) who has become obsessed with her after they had a one-night stand.

Their bedroom romp is probably J.Lo's most revealing sex scene yet. Not only does she strip down to just her underwear, but we see Guzman grab her bare breasts and slide his fingers between her legs.

Lopez never thought of using a body double.

"It was all me," Lopez told me while promoting the movie (in theaters on Jan. 23) at the Four Seasons Beverly Hills. "And all Ryan, by the way."

Jennifer Lopez, The Boy Next Door

IMDB

Stands-in just wouldn't work, Lopez said, because they needed things as close to real as possible.

"It was intense," she said. "Those scenes are embarrassing. They are uncomfortable, but your job as an actress or an actor is to make it believable and this movie in particular…hinges on if that was believable, that it was enough to make this guy go insane."

Before they shot the scene, Guzman says he told Lopez he was nervous because it was the first time he would be naked and doing such naughty things on camera.

"She was the one who kept me at ease," Guzman said. "She talked me down. She said, 'We're going to do this [and] we're going to do that. Everything is going to be fun. You're going to have fun.' It was."

Sure sounds like it—especilly when they had an unexpected "giggle fest" in bed.

"I looked at her and I think she started busting up laughing and then I started busting up laughing because she was laughing," Guzman remembered. "Finally, [Director Rob Cohen] was like after five minutes, 'Guys, let's get back to work.'"