But don't expect Pitt, 42, and Jolie to marry, she says.
"We are legally bound to our children, not to each other, and I think that's the most important thing," the twice-divorced actress is quoted as saying.
Jolie also tells Vogue about how motherhood has changed her.
"I think definitely before my son, I was a little nihilistic. But once I adopted Mad (Maddox) I knew I was never going to be intentionally self-destructive again.
"I'm starting to be able to see being 50 years old with the kids graduating from high school - though in my mind we're in the middle of a desert or a jungle with tutors and some local friends."
Pitt and Jolie appeared together Monday in New York City at the premiere of her new film, "The Good Shepherd."