Mel Gibson's Alleged Mistress: "Mel Was Very Abusive"

We've heard how crazy Mel sounds on the leaked tapes of his convos with baby mama Oksana Grigorieva, but another woman is coming forward saying she got the same treatment from the movie star!

Alleged Gibson ex-girlfriend Violet Kowal, who makes sure to let everyone know she's not a Polish porn star but a "fitness model" (is that what they're called in Poland?) said Mel was abusive to her during their short relationship. Which happened, by the way, while he was still with Oksana.

“He never hit me, but after the media found out about our relationship he got very abusive,” Violet told Fox’s Geraldo At Large last night. “He called me up screaming at me and threatening. He said that he would make me suffer.”

Mel and Oksana are currently caught up in the most contentious custody battle Hollywood may have ever seen. Although Violet doesn't have the same evidence of verbal abuse as Oksana does, she does say she has "phone records" of the phone calls.

Think they may call Violet to the witness stand?