“I can confirm Megan is expecting her second child with her husband Brian, they are both very happy,” Zelnick said.
Fox, 27, and Green, 40, married in 2010 and welcomed their first child, a son named Noah, just nine months ago.
After taking a short break from the silver screen, Fox has recently been working in Michael Bay's upcoming film, "Teenage Mutant Ninja Turtles" where she'll incarnate the yellow-jumpsuit wearing April O'Neil.
Though the actress' pregnancy is still on the early stages, Fox's rep explained that she kept it silent during filming because she did't want it to interfere with her work.
In the past, Fox has said that becoming a mother completely changed her perspective on life.
“I recognize the blessings when they come . . . the ultimate satisfaction for me is being with my son,” Fox told Marie Claire UK. “All I wanted to do my whole, whole life was have a baby and, now, I’ve finally done it. I just want to give Noah as much of myself as I can. And I want to have more kids. That is where my heart is,” she added.