No one was more surprised by Megan Fox's pregnancy than the actress herself.

The Versace-clad star of Teenage Mutant Ninja Turtles: Out of the Shadows debuted an unmistakable baby bump at CinemaCon in Las Vegas Monday night. Megan did not publicly address her pregnancy in red carpet interviews or while fielding questions during the panel discussion. However, multiple sources later confirmed to E! News that she is indeed expecting her third child with Brian Austin Green.

Megan is in her second trimester, according to an insider.

The New Girl guest star's pregnancy took many fans by surprise, given that she filed for divorce in August, with the date of separation listed as June 15. Megan cited "irreconcilable differences" as the reason for the split and requested joint physical and legal custody of their two sons, Noah Green, 3, and Bodhi Green, 2. (Brian also has a son, Kassius Green, 14, from a prior relationship.) Together since 2004 (and married since 2010), Megan and Brian continued to spend time together post-breakup, though neither actor ever said if they were rekindling their romance.

Megan Fox, CinemaCon

Chris Pizzello/Invision/AP

The actors' divorce is still pending, with Megan's attorney last filing paperwork Jan. 29; no future hearings are scheduled at this time. However, according to the insider, their divorce "will likely be put on hold for a while." The couple, who briefly called off their engagement in 2009, are now focused on Baby No. 3. "This pregnancy was not planned, but when they found out they were extremely happy."

In spite of whatever differences that caused them to split 10 months ago, "Megan and Brian love being parents," the insider tells E! News exclusively. "They are working really hard to be together and one unit—not only for their children, but also for each other. They are looking forward for the arrival of their new baby." And Megan knows she can rely on Brian, who's "been a great partner and father."

Megan Fox, Brian Austin Green

Charley Gallay/WireImage

Motherhood has been Megan's greatest role to date, and she takes it very seriously. For example, she told E! News' Marc Malkin she limits the amount of media her boys consume. "Noah is too young and I try to keep them from television and movies for the most part. I think any sort of screen—whether it's television, iPad or iPhone—is really bad for their brain development, so I try to remove that from their lives and I also want to deter them from ever being on social media because I think it's detrimental to a child's self-esteem," she said. "I have lots of opinions on this."

Megan will make exceptions from time to time, however.

"I do let them watch Pixar movies," she confessed. "We do stuff like that. We watch Peter Pan together. They have no idea what I do. Somebody at their school will tell them eventually, but then it won't mean anything because they've been around it their whole lives, so they'll be like, 'OK. I'm still embarrassed of my mom.'"

For more on Megan Fox's pregnancy, watch E! News tonight at 7 and 11.

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