Legal Question in Civil Rights Law in California

You can always formalize your marriage in California, or Las Vegas, or anywhere in the U.S. The missing fact in your question is why did you get married out of the country? And what country did you get married in? There have been well-publicized instances of people (usually men) getting married outside the country, in some obscure jurisdiction, and then denying the marriage when it later became convenient. I have no idea whether this applies to you, but especially if you are a woman you need to not ever be in a position where there is a question about the fact that you are married. This could affect your right to inherit and your community property rights.