It is not yet clear who the father of the child is. Fox filed for divorce from Green last August following a five-year marriage citing "irreconcilable differences." The couple separated six months before the divorce filing, which has not yet been finalized.

Despite parting ways, the two continued to remain friends for the sake of the kids and have been spotted together on several outings in the months leading up to Fox's pregnancy revelation.

Her most recent outing with her ex-hubby was last month when the pair were captured leaving a Los Angeles café.

Fox will be next be seen in the TMNT sequel when it hits theaters on June. 3. However, Fox told E! that in spite of the film being suitable for children, her kids will not be seeing the movie.

"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. I have lots of opinions on this," the 29-year-old said.

"I do let them watch Pixar movies. 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 okay. I'm still embarrassed of my mom," she added.