Will Arnett Has The Best Response To Megan Fox's #NotTheFather Post!

You have to love Will Arnett's sense of humor! As we reported, Megan Fox took to Instagram to dispel rumors about the identity of her third child's father. Turns out, Shia LaBeouf, Jake Johnson, and the Arrested Development star are "#NotTheFather." Related: Will Arnett Admits To Relapsing On His Sobriety! While not confirmed, sources say the baby belongs