Oksana Grigorieva Claims Mel Gibson Cheated; Not Fit for Child Visits?

Oksana Grigorieva is already coming out swinging before Mel Gibson's court hearing tomorrow. According to Oksana's attorney, she believes Me cheated on her with several women and is unfit for overnight visitations with their one-year-old daughter Lucia.

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Dan Horowitz, Oksana's attorney, told TMZ that his team has hired an investigator to find four women whom his client believes may have had a relationship with Mel.

According to TMZ, they hope one of the women will say Mel was violent toward them in order to prove he is too dangerous to be around their daughter.

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Currently, Mel has full visitation rights, but TMZ sources say Oksana believes he shouldn't be allowed overnight visitation.

According to TMZ sources, Oksana thinks Mel's nanny cares for Lucia more than he does.

The hearing tomorrow will reportedly address the issues of custody, which has been following the agreement made in May that Mel gets Lucia three days a week plus with one overnight visit.

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But Oksana is reportedly hoping to have that changed.