The Russian singer, who split from the actor in April after one year together, claims he physically assaulted her during an incident in January - whilst she was holding their eight-month daughter Lucia.
Radar Online has since obtained an audio recording in which the ‘Braveheart’ star reportedly admits to punching the 50-year-old in the face.
In the tape, the mother-of-one allegedly pleads,
“What kind of a man is that who would hit a woman when she is holding a child in her hands, hitting her twice in the face? What kind of a man is that?"
To which the 54-year-old supposedly responds,
"You know what - you f***king deserved it."
Following the allegations the Los Angeles County Sheriff’s Department have launched a domestic violence investigation.
In an official statement, a spokesman confirmed,
"An investigation of domestic violence was launched by Malibu/Lost Hills Station Detectives in July, 2010, involving actor Mel Gibson and his former girlfriend, Oksana Grigoieva.
"The Detective in charge of the investigation is currently gathering information regarding the allegations.
"Due to the investigation being preliminary in nature, no other information is available at this time."
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