Pregnant Megan Fox and Ex Brian Austin Green Spotted Grabbing Lunch Day After Baby News

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While questions surrounding the paternity of Megan Fox's unborn baby continue to swirl, the actress and her estranged husband, Brian Austin Green, spent Tuesday afternoon grabbing lunch in Santa Monica, California.

Decked out in a billowing, cleavage-bearing sundress, Fox and her ex strolled down the street together a day after news broke that the Teenage Mutant Ninja Turtles star was pregnant with her third baby.


WATCH: Megan Fox Pregnant With Third Child, Debuts Tiny Baby Bump at CinemaCon

Fox and Green already share two sons -- 3-year-old Noah and 2-year-old Bodhi. Though their divorce is not finalized, Fox filed papers to end their marriage in August 2015 citing "irreconcilable differences."

While they split months ago, the two have frequently been spotted spending time together, often going on outings in Los Angeles with their kids.

Fox's baby bump is noticeably more pronounced than when she showed it off on the red carpet at CinemaCon in Las Vegas on Monday.

Getty Images

WATCH: Jaime King Talks Megan Fox’s Surprise Pregnancy

Given their pending divorce, speculation quickly arose regarding the father of Fox's third child. The 29-year-old star responded to the rumors Tuesday morning, jokingly Instagrammed a three-way split image of former co-stars Shia LaBeouf, Jake Johnson and Will Arnett, with the caption, "#NotTheFather."

WATCH: Megan Fox Reveals Which of Her Co-Stars Are 'Not the Father' of Her Unborn Baby

Many have noted that Green does not appear in her post, furthering speculation that her ex is likely the father.

ET caught up with Arnett at CinemaCon on Tuesday where he had some fun over the Internet-fueled paternity rumors, joking that finding out he wasn't the dad was "a big surprise." Check out the video below to hear more from Fox's TMNT co-star.