Jennifer Lopez gave more than her time and her talent for the new movie, "The Boy Next Door." She also pulled a few items from her own closet to wear in the film.

Lopez plays Claire Peterson, a recently separated school teacher with a teenage son, who enters into a sizzling affair with her sexy, 19-year-old neighbor (Ryan Guzman). She soon regrets her decision when he grows dangerously obsessed with her.

"Wardrobe can get really expensive," Lopez said in a recent interview (via The Associated Press). "With this movie, we didn't have that luxury. It was about, 'Who is Claire? What's the palette? We'll use my jeans, my shoes, my sweaters.' A lot of things were money."

The movie is projected to make at least $16.5 million over the opening weekend, more than four times its original budget ($4 million).

J. Lo also served as an executive producer on the project, which took only 25 days to shoot. When it came time to film her big sex scene with co-star Guzman, she made several suggestions to put her more at ease with the shoot.

"There's power in preparation and so the more I knew each and every shoot that (director Rob Cohen) was doing, I could feel confident in what I was doing," she said. "I was like, 'I don't want to do this and I don't want to do this. I feel comfortable with this. I don't feel comfortable with that."

"The Boy Next Door" also stars John Corbett, Kristin Chenoweth, Ian Nelson and Lexi Atkins. It opens in theaters today.