The yacht will be built in the shipyard of Civitavecchia, a port town north of Rome, by luxury shipbuilder Privilege Yard SpA, which said Wednesday that the couple has commissioned an 280-foot-long yacht for $268 million.
Delivery is set for July 2009.
The passenger cabin will include two 3,200-square-foot apartments, plus two guest suites of 1,600 square feet each.
Other features include a swimming pool, a heliport, speedboats and a small submarine that will allow guests to explore the sea up to a depth of 980 feet.
Photos: Angelina Jolie: Viet Mom