The News of the World, citing a source, said the couple, who never married, agreed to share their large fortune and their six children, three of them adopted. The children would live with Jolie.
"The contract was like a tailor-made version of a prenuptial agreement except for an unmarried couple's split," the source said. "It seemed clear they want the world to know they'll both play a part in the upbringing of the children."
Pitt, 46, and Jolie, 34, began their relationship while playing married hired guns in "Mr. and Mrs. Smith." The News of the World said they consulted a lawyer late last year and signed an agreement in early January.
On Friday, Pitt and his ex-wife, Jennifer Anniston, were both backstage at a fundraiser for Haitian earthquake relief.
Copyright 2010 by United Press International.