"They are flying in 200 to 300 guests," express.co.uk quoted a source as saying. The guest list is likely to include Matt Damon, George Clooney, Johnny Depp and Tom Cruise.
The couple is said to have spent millions refurbishing Château Miraval, their 35-room retreat near the village of Correns in the heart of Provence.
After dating each other for seven years, Pitt and Jolie announced Saturday that they are engaged. The couple raises six children together Maddox, Pax, Zahara, Shiloh, and twins Knox and Vivienne.
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