There are other elements of the divorce filing suggesting a challenge ... writing about community and quasi-community property.The argument goes this way ... if the prenup is successfully challenged, the confidentiality clause is not enforceable. Even the threat of that will get Britney's attention. Here's the reality. Multiple sources tell TMZ ... Sam has A LOT of first-hand knowledge about Britney, their relationship, their arguments, her challenges, etc., and if there's even a possibility any of that might become public, Britney will gladly pay Sam for peace of mind.