Mel Gibson and Oksana Grigorieva signed an agreement in December 2009 stating neither had a claim to the other's property, a month before their January blowout.

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TMZ obtained a copy of the couple's 22-page "Cohabitation Agreement" in which they acknowledge "they have no right to the property of the other" and that "neither party has promised the other to assist in funding any support for each other or the other party's children from other relationships."

The agreement repeatedly stipulates that Gibson owes Grigorieva nothing and that their assets will remain separate. It states Gibson had the right to evict her from his Sherman Oaks home with 12 months written notice. The only item Grigorieva is explicitly allowed to keep under the terms of the agreement is a Dodge Charger Gibson bought her.

But all that "agreement" went out the window a month later, when Grigorieva began demanding money and secretly recording her conversations with Gibson, law enforcement sources told TMZ.

The couple went into mediation in May, during which Gibson agreed to give Grigorieva and their daughter Lucia $15 million in exchange for the audiotapes and other "evidence," TMZ said.

But much of that evidence famously made it into every tabloid in the country.

TMZ asked Grigorieva's lawyer, Daniel Horowitz, how she went from wanting no money to demanding millions in a matter of months.

"When she signed the agreement in December she had no idea Mel would be treating her like a punching bag in January. She gave up her career for a man who started beating her," Horowitz replied.