Megan Fox Addresses Paternity of Baby No. 3

After news broke that Megan Fox is pregnant with her third child, she took to Instagram with a collage of pictures that featured her with several of her co-stars and the hashtag #NotTheFather.

#notthefather

A photo posted by Megan Fox (@the_native_tiger) on Apr 12, 2016 at 12:47pm PDT

And Will Arnett had some funny words in response when he spoke to Entertainment Tonight at CinemaCon in Las Vegas on Tuesday.

Feigning shock, the funny man responded, "She said I'm not the father? That's a big surprise to me."

Fox walked the red carpet at the event with her Teenage Mutant Ninja Turtles costar, revealing her burgeoning baby bump.

Surprise! #MeganFox is pregnant with baby number 3. She showed off her baby bump while at #CinemaCon w/ #TMNT co-star Will Arnett last night!

A photo posted by Entertainment City (@entcity) on Apr 12, 2016 at 4:08am PDT

The actress and her estranged husband Brian Austin Green are parents to two boys, Noah, 3, and Bodhi, 2.

Fans were quick to note that Green did not appear in the #NotTheFather collage! (And according to sources confirmed through PEOPLE, Green is indeed the father.)