The 61-year-old welcomed a baby boy with girlfriend Rosalind Ross, 26, on Saturday in Los Angeles.
According to People, they named their son Lars Gerard Gibson and he weighed in at 5 lbs. 5 oz
A source told the website: '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!'
The director 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.
He also has a six-year-old daughter, Lucia, with former girlfriend Oksana Grigorieva.