Imagine that you are preparing for your big wedding day. As you get dressed for the big occasion, your spouse comes to you and says that the two of you should sign a prenuptial agreement. The contract will protect you, your spouse says. Since you trust your spouse, you sign it, thinking that the document is in your best interest.
This hypothetical situation is actually just one way in which a prenuptial agreement can be deemed invalid. Prenuptial agreements are critical documents that can help any couple getting married -- but they also aren't perfect documents that are shielded from a legal challenge. The spouses must draft their prenup and discuss the topics that they will include in their prenup thoroughly before they sign. Not having enough time to consider the document can make the document (if not all of it, then part of it) invalid under a legal challenge.