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The Hollywood stars have been in a relationship for around seven years and raise six children together.
They had previously insisted they won’t marry until people in same-sex relationships can too, although Brad recently admitted that fully committing to Angelina is becoming more important to him.
It’s now been suggested the pair are already planning their wedding, which will be held at the chateau they own in France.
“Brad and Angie have kept this quiet, and they're talking about how and when to announce it,” a source told the American edition of OK! magazine. “They really get a kick out of teasing people with this whole thing.”
It’s not known exactly when the superstars will tie the knot, although it is thought the wedding will take place later this year.