The 36-year-old actress is preparing to wed Pitt after seven years together, and wants the nuptials to reflect the different ways people celebrate marriage, in particular the home countries of their adopted children, reported Contactmusic.
"She wants to incorporate different ethnic wedding traditions from around the world into one alternative ceremony and event," a source said.
"Fight Club" actor Pitt, 48, is also said to be keen on their wedding being more traditional, and held at their French chateau.
"They both agree on the essentials, like the fact they want it to be a big celebration with their family and friends.