Almost everything you wrote is factually incorrect. Prenuptial agreements are upheld 99.999% of the time; it is the extremely rare case that a prenup is voided, which is why such situations make the news.

Also, in a community property state like CA, all assets acquired during marriage are presumed to be "community property" of both spouses, unless there is a prenuptial agreement specifically describing the ownership of assets acquired during the marriage using a spouse's individual and separate pre-marital assets (i.e., pre-marital savings). Thus, an estate planner could not do anything to help you in this situation.

Don't be an armchair lawyer if you don't know what you're talking about.