The publication writes that Penn and Theron plan to adopt a child soon after getting married.
“Charlize always intended to have another child,” the source told the mag.
The 38-year-old actress already has a son Jackson, 2.
Recently, Theron opened up in an interview to the June issue of Vogue about marriage, saying that it is not in the cards right now.
“Let’s put it this way: I never had the dream of the white dress,” she told Vogue then.
“And watching other people getting married? I think it’s beautiful for them, but to be quite honest, usually I’m sitting there just devastated. It’s supposed to be this night of celebrating love, and all you see is a couple separated all night making sure everybody else is okay. It just looks like a lot of work. And as you get older, you start sifting through the stuff that really matters,” the actress added.
Theron and Penn, 53, were first spotted together in Hawaii, on December 30, igniting speculation that they were an item.