A postnup, unlike a prenup, is signed after the marriage. A postnuptial agreement is designed to accomplish the same things as a prenup, but special rules apply in Louisiana.
Most postnuptial agreements are created after a major change in the marriage, such as the adoption or birth of a child, a major career change, or an inheritance. Under Louisiana law, postnups require judicial authorization. This means the court must give pre-approval before the agreement takes effect.