While the Deadpool star already has one daughter with wife Blake Lively -- James will turn two in December -- followers were quick to infer that Reynolds' newest addition was also, in fact, a baby girl.
Reynolds and Lively, who gave birth in late September, have yet to reveal any information about their second child -- and didn't confirm their first daughter's name until months after she was born.
But back to the actor's possible slip. Kutcher made a similar gaffe earlier this month, when talking about his daughter Wyatt's reaction to Mila Kunis' pregnancy on the Today show.
"She points to Mila and she's like, 'baby brother' when she points to the belly, and then she points to dad and she goes, 'beer.' So I think she gets there's something in the belly, but I don't quite think that she knows that it's not going to be a plastic doll yet," he said.