With some serious dance moves!
The 24-year-old dancer told People that they spend so much time together during dance rehearsals they have turned it into their date nights.
"Rehearsal is date night," Casper said at the American Music Awards Sunday. "We're in rehearsal until 3 a.m. every morning."
In addition to her rehearsal duties, J.Lo is also shooting the upcoming film The Boy Next Door, in which she plays a woman who has an affair with her teenage neighbor.
"She's filming a movie, so she would come to rehearsal after," Smart continued. "So I'd be there like 12 hours and she would shoot like 12 hours [on] the movie and then come to us.
"Rehearsal is so fun," he went on. "Learning a special move she does in the show was fun."
Of course, spending time together at rehearsals isn't all the duo does together.
They recently took a trip to Italy and were spotted grabbing dinner during a romantic night out in Rome.