VIDEO : Will Arnett is Surprised Megan Fox Said He's Not Responsible for Her Pregnancy

Will Arnett got in on the fun and joked about the questions surrounding the paternity of Megan Fox?s third child in an interview with Entertainment Tonight. Fox, 29, jokingly posted a collage of former costars Arnett (Teenage Mutant Ninja Turtles), Shia LaBeouf (Transformers) and Jake Johnson (New Girl) with the caption ?#notthefather? on Tuesday, April 12, just a day after she debuted her tiny baby bump in a form-fitting dress at CinemaCon in Las Vegas. ?She said I?m not the father?? Arnett, 45, told ET, feigning shock.