Gilbert Arenas' ex-fiancee is free to talk smack and get in as many catfights as she wants on "Basketball Wives LA" -- thanks to a federal court decision today.

A judge ruled against the NBA star's request to block Laura Govan from appearing on the show and mentioning his name.

The judge said Gilbert's claim that details of his family life should not be aired on the reality show -- is undercut by the fact he has "tens of thousands of Twitter users who follow [him] as he tweets about a variety of mundane occurrences."

Arenas has 51,103 Twitter followers. He and Govan have 4 children together.