Can you make a prenuptial agreement after you got married
No, but you can enter into a post-nuptial agreement.
By using a post-nuptial agreement, you and your spouse can choose to opt out of California's community property laws and agree to treat your assets as separate property.
You should consult with an attorney to take care of this for you. Our firm is located in Long Beach.
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Family Law Attorney
As noted in the previous answer, you cannot (because it's no longer PRE-nuptial) but you CAN make a "post-marital" agreement.
Making a binding post-marital agreement is more complex than making a binding pre-marital agreement, requires more complicated financial disclosure in the document, and there may be some things which you can do in a pre-marital agreement which you simply can't do at all in a post-marital agreement.