"This will confirm that Oksana Grigorieva and Mel Gibson welcomed the arrival of a baby girl named Lucia on Friday, Oct. 30, 2009, at an undisclosed hospital in Los Angeles," publicist Alan Nierob tells E! News. "No further details are available at this time."
The 53-year-old Oscar winner confirmed he and the Russian-born singer were expecting during a Tonight Show appearance in May, dubbing himself "Octo-Mel."
He has six sons and one daughter with his estranged wife, Robyn. She filed for divorce after 28 years of marriage in April, when photos surfaced of the star and Grigorieva in Costa Rica, and he came clean on his affair.
Grigorieva, 39, has a son from her relationship with former Bond star Timothy Dalton.
Hollywood has baby fever! Check out other celebrity mommies-to-be in our Baby Bumpin' gallery!