It seems risky. From the ABC article, not only do you have to worry about signing to close or after a marriage date has been set -but you also have consider.

1. How LONG were you in the relationship previously? You have to not only get this done well before the marriage date, you have to get it done from the get go ideally.

2. Mental capacity. Want to invalidate a prenup? Get HIGH AS FUCK a few hours before you sign it. Or you know...maybe take certain prescription medications.

3. And from a HuffPost article -it matters how things are divided. You don't have total customization -if what's being awarded with the prenup is dramatically or "significantly" different than what would be awarded without the prenup then it's invalid. So you can't really "save" yourself assets, only predetermine what you would part with.

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Another question of time has to do with how long the couple was established before they decided to get married.

"If the couple had been living together, was already involved sexually and had perhaps made babies together, their relationship is unique," Hennenhoefer said. "If the prenup does not reflect that, it can be tossed out. If the couple was established, they have a confidential relationship, which is different from the sort of fiduciary relationship two people looking to enter a business contract might have."

Aside from the timing of the agreement, a lawyer is also going to look at what other "external factors" were at play when the contract was signed, said New York divorce attorney Raoul Felder.

"Getting out of a prenup isn't a do-it-yourself job," Felder said. "You need a lawyer to look at the external factors and determine if there was extortion, fraud or duress

Those are all legal ways of saying that if you were tricked or forced into signing the agreement, you can likely get out of it.

Another way out of a contract is to prove you were "lacking capacity," Felder said.

"If someone said, 'Sign, or I'm going to hit you over the head,' that's duress," he said. "If you were taking drugs when you signed, that's lacking capacity."