Mel Gibson is a prolific dude!

The Aussie actor welcomed his ninth child -- his first with girlfriend Rosalind Ross -- on Monday, Jan. 23rd.

The baby boy is named Lars Gerard Gibson and is Ross' first and Gibson's NINTH child! Gibson, 61, has a daughter and six boys with his ex-wife Robyn Moore, to whom he was married for 28 years. They divorced in 2011, after Gibson father another daughter with girlfriend Oksana Grigorieva.

Ross, 26, is an equestrian vaulter (who knew THAT sport existed?!) and the two began dating in 2014.