Actor Jack Black let the news slip while doing a joint interview on Wednesday with Jolie in the French Riviera to promote their movie, Kung Fu Panda.
"You're going to have as many as the Brady Bunch when you have these," he said during the chat with the Today show's Natalie Morales.
Asked by Morales if she was indeed having twins, Jolie replied, "Yeah, yeah, we've confirmed that already. Well, Jack's just confirmed it, actually."
The babies will be the fifth and sixth for Jolie and Pitt. The family currently consists of Maddox, 6, Pax, 4, Zahara, 3, and Shiloh, who turns two this month. All except Shiloh are adopted.