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The actress, who is pregnant with twins, said the pair want to do as much as they can to help underprivileged children.
She told the Sydney Morning Herald: "We keep thinking, 'Is there ever going to be a time when we don't have kids in the house?'
"Maybe we'll eventually start a foster home or something. We have a clinic that handles children so there are ways of looking after kids without actually physically having them in your home and we're doing more and more of that. But I think we will adopt again. I'd like to do it again."
The couple, who currently have three adopted children and a biological daughter, recently bought a 35-bedroom French mansion to accommodate their growing family.
Talking about the possibility of marrying Pitt, Jolie said: "We don't need to do it but one day we will. Maybe if the kids start asking - they'll probably be the ones to make the decision."
> Jolie and Pitt 'plan to stay in France'
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