The couple posted an Instagram video on Tuesday featuring their first child, 19-month-old Luna Simone. “Luna, what’s in here?” the 31-year-old Teigen asked while pointing at her stomach. Luna’s excited response: “B-B!” In case there was any doubt, Tiegen titled the post, “It’s John’s!” In a now-deleted Twitter post, Legend, 38, responded by joking, “Maury [Povich] will have the final word on this.