Mel Gibson and girlfriend Rosalind Ross have welcomed their first child together, a baby boy named Lars Gerard Gibson.

Lars was born Friday, Jan. 20, in Los Angeles and weighed in at 5 lbs. 5 oz, he is the ninth child for 61 year old Gibson, but the first for Ross, 26.

Mel Gibson and Rosalind RossMel Gibson and Rosalind Ross have welcomed son Lars Gerard Gibson

A source confirmed the news to People and added: “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!”

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Gibson and Ross have been dating for two years and confirmed they were expecting their first child together in September. At the time a source told People “Mel and Rose are so excited about the baby. Mel loves being a dad and he and Rose can’t wait to be parents together. The last two years have been some of his happiest years he’s ever had.”

Mel is already a father to eight children, most of whom are older than Rosalind. He has seven children with ex-wife Robyn Moore: Hannah, 36, twin boys Christian and Edward, 34, William, 31, Louis, 28, Milo, 26, and Thomas, 17, as well as six-year-old daughter, Lucia with former girlfriend Oksana Grigorieva.

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Rosalind is a former equestrian champion who is now working as a screenwriter. The couple were last seen in public at the Golden Globe awards earlier this month.