The Hacksaw Ridge director and his girlfriend of two years, Rosalind Ross, have welcomed their first child together, Gibson's rep confirmed to ET.
The couple's new son, Lars Gerard Gibson, was born in Los Angeles on Friday, weighing 5 pounds, 5 ounces.
Gibson is already the father of eight children. The Oscar-winning filmmaker shares seven children with his first wife, Robyn Moore, including one daughter -- Hannah, 36 -- and seven sons -- twins Edward and Christian, 34, William, 31, Louis, 28, Milo, 26, and Thomas, 17.
Gibson and Moore separated in 2006 and their divorce was finalized in 2011.
Gibson also shares a 7-year-old daughter, Lucia, with his ex-girlfriend, Russian singer-songwriter Oksana Grigorieva.
Earlier this month, ET caught up with the Braveheart star at the Golden Globes where he jokingly bragged about having more kids than Clint Eastwood.
"I was talking to Clint the other day. I said, 'How many kids you got?'" the 61-year-old actor shared. "He said, 'Eight.' So I'm beating him."
