She wants the ceremony reflect the different ways people celebrate marriage, in particular, the home countries of their adopted children - Cambodian Maddox, 10, Ethiopian Zahara, 7, and Vietnam-born nine-year-old Pax.
"She wants to incorporate different ethnic wedding traditions from around the world into one alternative ceremony and event," contactmusic.com quoted a source as saying.
Pitt is said to be keener 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. Brad is traditional, whereas Angelina can be alternative. Brad envisioned a traditional ceremony, followed by dinner, speeches and a party," said the source.
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