UPDATE: Mel Gibson's Ex, Oksana Grigorieva, Makes Domestic Violence Allegations

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It was a heated exchange in early January – with their baby daughter caught in the middle – that has led to domestic-violence allegations against Mel Gibson by his ex-girlfriend Oksana Grigorieva, WHO has learnt.

The Russian-born singer, 40, alleged in an emergency restraining order filed on Monday, June 21, against Gibson, 54, that he struck her during an argument at his Malibu home.

TMZ.com reports Grigorieva sources saying, "She tried to protect the baby during one of Gibson's violent episodes when he punched Oksana in the face two times, breaking her teeth and giving her a concussion."

A Gibson source says the allegation is distorted.

"Oksana was completely out of control that day, screaming and shaking Lucia like a rag doll," says the source. "Mel stepped in to stop her from injuring the baby."

The source further alleges Grigorieva then withheld 7-month-old Lucia from the actor for the US Father's Day last weekend, despite a custody agreement allowing the visit, which resulted in a face-off in a Los Angeles court on Tuesday, June 22.

"He was as frustrated as any father would be when they're kept away from their child," says a second Gibson source. "He was with all his kids and family and the one person missing was Lucia. Oksana is not putting the interest of their daughter first."

Adds the first Gibson source: "The allegation that Oksana is in fear of Mel is ridiculous. From January to March, she travelled with Mel to London and Paris at her insistence. This is all an attempt to gain financial advantage over him."

However TMZ.com reports the Grigorieva source as saying: "Mel and his camp are spinning the facts in a desperate attempt to protect his reputation."

Oksana: Custody Agreement Unfair
A source close to Grigorieva wouldn't comment to WHO on the alleged physical altercation, but denied the drama was escalated by the singer withholding their daughter.

"That is absolutely not what caused all this," the Grigorieva source says. "There's other reasons in this case that brought it to where it is today. Oksana doesn't feel the custody agreement is fair."

Grigorieva voiced her frustration on Friday, June 25, to reporters outside her San Fernando Valley home. "He's playing dirty. The truth will come out," she told RadarOnline.com. Later, a somber-looking Grigorieva told WHO: "I'm doing OK. I really am. There's nothing more I can add."

Gibson, who is temporarily forbidden from contacting Grigorieva, was granted access to Lucia after his lawyers presented the judge with the custody agreement that the couple hammered out in May after they split.

The actor also filed his own restraining order against Grigorieva on Tuesday, June 22, but it only prevents her from speaking about certain sensitive aspects of the case.

A hearing on whether to extend the restraining orders is set for July 20.

The Oscar winner, 54, and the Russian musician-singer, 40, had been together about a year by the time they broke up in April 2010.

While at the time of the split a friend of the couple told WHO, "They're still friends and they'll both raise Lucia together," since then their relationship has become less amicable.

Though the legal documents, which were filed Thursday, June 24, in Los Angeles Superior Court, are sealed, RadarOnline.com, which first broke the story, reports that the main issue involves Gibson's access to the child.

Gibson, who just completed filming How I Spent My Summer Vacation, resides in Malibu. Grigorieva, meanwhile, is still living in a Sherman Oaks, California, home owned by Gibson – and has been doing so since their split.

She was reportedly served the legal papers there.

Gibson's rep has no comment.

In April 2009, Robyn Moore, the actor-filmmaker's wife of 30 years, filed for divorce from Gibson, citing irreconcilable differences. Later that same month, he and Grigorieva made their first public appearance together as a couple.

In addition to Lucia, Gibson is the father of seven children – six sons and one daughter – while Grigorieva has a son, Alexander, with her former boyfriend, British actor (and short-term James Bond star) Timothy Dalton.

• Additional reporting by ELIZABETH LEONARD and JOHNNY DODD

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