When it comes to why mom and dad aren't married, Brad Pitt's and Angelina Jolie's six kids aren't ignoring the elephant -- or should we say, big green ogre? -- in the room.
"They have asked, yeah, because they see movies and people get married in the movies," Jolie tells Monday's edition of Nightline. "Shrek and Fiona are married, you know?
"We've explained to them that our commitment, when we decided to start a family, was the greatest commitment you could possibly have," Jolie, 36, said regarding her brood: Maddox, Pax, Zahara, Shiloh, Knox and Vivienne.
"Once you have six children,” she said, “you're committed."
Jolie joked she asked the kids if they were nudging her in the direction of the altar "just because they wanted to have a big cake."
Watch the video on RadarOnline.com
The full piece with the A-lister airs on Nightline Monday at 11:35/10:35c; Jolie's directorial debut, In the Land of Blood and Honey, hits theaters December 23.