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Much to our shock, Megan Fox is knocked up with her third baby! What?!

The Teenage Mutant Ninja Turtles actress made the big baby bump reveal when she wore a sexy bodycon dress to CinemaCon in Las Vegas on Monday night. The actress made sure all eyes were on her and her growing belly when she stepped out with Will Arnett at the event.

There's no doubt that the leggy display was intended to catch the attention of the press -- and it certainly worked!

Our real question is: who's the dad?! We of course think it's her estranged ex, Brian Austin Green, who are parents to two sons Noah, 3, and Bodhi, 2.

The news comes as a surprise because Fox filed for divorce from Green in August 2015 after five years of marriage. In September, BAG filed for spousal support from his more successful wife. But since then, we've seen the couple around town and it seems like they never really did separate.

So we have a feeling that baby No. three's daddy is the Beverly Hills, 90210 star. Well if a relationship isn't really working -- it always seems to help to throw another kid into the mix!

Good luck, guys!