Oksana Grigorieva turned down a $15 million settlement offer from ex-lover Mel Gibson because he wanted shared custody of their daughter.

The Russian singer - who is currently involved in a bitter custody battle with Mel for their 11-month-old daughter Lucia - refused the huge financial offer because she didn’t want the “unstable” actor getting so much access to their child.

“The $15 million was a proposal that I walked away from because he wanted 50 per cent custody of an infant when he’s unstable.”

Oksana also claims Mel punched her in the head while she was holding Lucia, during an argument on January 6. “Mel ran in and started screaming all kinds of nasty words.  Then he just hit me twice with his fist. Boom, boom, to my head and my mouth. I fell on top of the bed. I’m just covering the baby and not protecting myself. He proceeds to choke me with both his hands,” she said in an interview with People magazine.

The 40-year-old beauty alleges the 54-year-old actor used a mixture of threats and pleading to convince her not to leave him after the incident:

“The worst thing for Mel is public humiliation. He threatened to kill me if I went to the police. You can’t just cut off love when you’re a victim of domestic violence.  He was begging for another chance the following day. On his knees. He apologized for hitting me. He said he will never, ever touch me again.”