Legal Question in Family Law in California

There is no conflict of interest unless the firm your current wife is seeking to hire has represented you previously.

From the facts you have given, there appears to be no conflict of interest.

I disagree with the previous answers implication that it is so cut and dried. It is quite possible that the interests of your ex and you current wife could come to be in conflict. You only have so much money, for example, and they both want the largest possible piece of it. That is not, however, a conflict that you have any standing to assert. One of them would have to assert it against the other.