Mel Gibson and his girlfriend have given birth to a baby girl

Mel Gibson has become a father for the eighth time.

The “Lethal Weapon” actor’s girlfriend Oksana Grigorieva gave birth to a baby girl on Friday, October 30, and both mother and daughter are said to be doing well.

The baby, whose name is yet to be revealed, was due in December.

Gibson, the son of an Irish born mother, already has seven children with his estranged wife Robyn, who filed for divorce in April this year after 28 years of marriage. Grigorieva has a son, Alexander, with former boyfriend Timothy Dalton.

In September, Grigorieva spoke of her excitement at becoming a mother again.

She said: "I have a 12-year-old, so I've been a mother for 12 years – and of course, there is no first time mother's trepidation as such. So naturally it's more relaxed, and I'm very dynamic so the pregnancy falls into my work schedule."

Gibson, 53, confirmed the rumors of his new girlfriend’s pregnancy in May on, telling Jay Leno: "This is true. We're going to have a child."

Leno then joked the new arrival would be the Irish-American actor’s 29th child, prompting the “Mad Max” star to liken himself to Nadya Suleman, who famously gave birth to octuplets last January.

Gibson replied: "Well, actually eight. I guess I'm Octo-Mel."