Mel Gibson's ex-girlfriend Oksana Grigorieva won't be talking to Oprah after all.

Grigorieva and Gibson just hashed out a joint-custody deal for their daughter, Lucia, in which Gibson has been ordered to pay $20K a month in child support.

Due to the nature of the proceedings in family court, a judge has put a gag order on the couple, reports, which will keep Oksana off Oprah's couch.

"Neither party in the case should be speaking," a source told E!