A year after welcoming twins Max and Emme, Jennifer Lopez is back at work, shooting the romantic comedy The Back-Up.
"The few days before I got really nervous," she tells Entertainment Tonight. "I was like, 'What if I forgot how to act?!"
How does she balance work and motherhood?
"I bring the babies to work with me. I love it," she says. "Honestly, one of the best days of my life was the first day back working on this film -- I wanted to do this film really badly -- and bringing my babies with me that morning. I was like, 'Oh my God, they're with me, I'm making a movie, they're here!' It's great having kids on set. It's the best."
As for getting back in shape?
"It did take a lot of work," Lopez, 39, admits. "I thought it was gonna drop off easily because I had been in shape my whole life, but it wasn't. I gained about 50 pounds with my twins, and the first 30 dropped off like that, and I was like, 'Ha, this is gonna be so easy.' That last 20 -- that took a while."