Mel Gibson and his girlfriend Rosalind Ross are reportedly celebrating the birth of their first child together.

The baby boy - the 61-year-old actor's ninth child - was born in Los Angeles over the weekend and has been named Lars Gerard Gibson, according to reports in the US.

“They’re thrilled and Lars is adorable. Their family is all around them and Mel is over the moon. They’re home and everybody is healthy and happy!” a source told People magazine.