Jennifer Lopez gave fiance Alex Rodriguez a hot night out to prepare for her role as a stripper in "Hustlers."

The movie's writer and director, Lorene Scafaria, revealed to Vulture, "She and Alex went and visited a strip club, and she was able to give me some… insights."

Scafaria said the 49-year-old triple-threat used her supreme athleticism in a big way for her pole-dancing scenes.

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"She’s obviously such an unbelievable dancer, but she trained so hard-core for this," Scafaria said. "Pole dancing is not like anything else. It required muscles you don’t know you have. So we did treat it a little bit like a sports movie in that way."

Constance Wu and Jennifer Lopez film "Hustlers" in West Nyack, N.Y. (Getty)

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Scafaria also admitted that she was almost desperate to land J.Lo for the role of Ramona in the film, which is based on a 2015 New York Magazine story.

“The moment I finished the script, I realized: 'Oh my God, Ramona is Jennifer Lopez,'” Scafaria said. “Jennifer Lopez is Ramona. The two of them are the same; they have all of these similar qualities. It has to be her.”

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Landing Lopez made it easier to book other talent in the movie, including Constance Wu, with whom Lopez grew close during filming, as well as rappers Cardi B and Lizzo.

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“Casting was made infinitely easier once Jennifer was attached. Everybody really, really, really wanted to work with Jennifer," Scafaria said. "That was the beauty of making this movie, too: casting what felt like the right people for each part, and watching them interact the way that they should with each other.”