Surprise! Megan Fox pregnant with third child

Bump’s the word.

Megan Fox is expecting her third child … though it’s unclear with whom.

On Monday, the “Teenage Mutant Ninja Turtles” beauty shocked photographers when she showed off her growing baby bump in a tight black minidress at CinemaCon in Las Vegas.

Fox, 29, who shares sons Noah, 3, and Bodhi, 2, with estranged husband Brian Austin Green, filed for divorce last August after five years of marriage.

While Green, 42, responded to the filing in September seeking spousal support, he and Fox have been spotted together on several occasions. In March, the pair stepped out to the Sweet Butter Cafe in Studio City, Calif.

Reps for Fox didn’t immediately return our request for comment.