"Ideally I'd like to have a couple," she tells InStyle magazine in its January issue. "But who knows."
The actress adds that her dreams of a family in the future are "part of the unknown that I like."
As for her romantic life, Aniston says she never made a conscious decision to start dating but that she gradually got ready for it. "You just wake up one day and you start to feel like, 'Yeah I think I'm open to that now.' It's not mapped out. It just sort of happened."
Aniston hasn't officially confirmed her relationship with Vince Vaughn, who costars with her in the upcoming comedy The Break Up, but the pair have been spotted kissing, canoodling and walking on the beach near her Malibu home. The couple also spent Thanksgiving together in Scottsdale, Ariz.
Meanwhile, Pitt has clearly moved on. Earlier this month he announced that he's started the process of adopting Jolie's son Maddox, 4, and daughter, Zahara, 11 months. The children's last names will officially be changed to Jolie-Pitt.