Brad Pitt and Angelina Jolie already have 6 kids. They may adopt again because they promised Zahara lasttime that they will adopt one from where she was born.
A source said: "They are really excited about it. Brad and Angie made a promise to Zahara years ago that they would adopt another child from the region so she could have a sibling to relate to."
The source added to the Daily Star newspaper: "Also, seven has always been Brad's lucky number. He and Angelina think it would bring them luck and happiness."