Credit: Barry King/FilmMagic

Oksana Grigorieva is speaking up for herself.

Mel Gibson's ex and the mother of his 8-month-old daughter Lucia briefly broke her silence on Friday as she encountered paparazzi outside her lawyer's office in Century City, Calif.

Recently accused by Gibson's camp of attempted extortion, she slammed the charges. "Mel is lying. He's lying. There's no extortion, and there's no texts and no emails," Grigorieva, 40, said. "I'm fighting for my child. [Mel's] just a liar, and it will come up in the court, just wait." The Los Angeles Sheriff's department recently confirmed that it is investigating the extortion charge. Meanwhile, Gibson, 54, is the subject of a domestic violence probe.

The Russian-born musician also slammed reports that her younger sister leaked the infamous phone tapes that hit Radaronline.

"She (her sister) doesn't have them," Grigorieva said of the shocking tapes in which an irate, screaming Gibson spewed racial and misogynist epithets and threatened his ex with violence. "She erased them a long time ago."

In fact, her rep told Entertainment Tonight: "Oksana emphatically denies that anyone on her side, specifically her sister, leaked or marketed to Radar Online or anyone else ... Radar has again confirmed it was neither Oksana or her sister who gave them recordings."