Megan Fox — In Case You're Wondering Who's the Daddy ….

Megan Fox has been giving multiple clues on the identity of her baby daddy, and by process of elimination it’s pretty clear … Brian Austin Green is the leading candidate.

A noticeably pregnant Megan and her estranged hubby strolled into a Santa Monica restaurant Tuesday for lunch.  

It’s relevant because earlier in the day Megan Instagrammed pics of 3 of her recent co-stars — Shia LaBeouf, Will Arnett and Jake Johnson — with the hashtag, #notthefather.

TMZ broke the story last August when Megan filed for divorce, but she’s been cozy with Brian and their 2 kids recently, so it seems highly likely at the very least they’re having their 3rd kid.