It looks like Mel Gibson is back on diaper duty after welcoming his eighth child into the world. The actor's girlfriend, Oksana Grigorieva, gave birth to a baby girl on October 30 in LA. The couple named their brand new baby girl, Lucia. They stepped out together in public shortly after Mel announced he was getting divorced from his wife, Robyn, in April. Mel already has six sons and a daughter from his marriage to Robyn, while Grigorieva has a son with former boyfriend Timothy Dalton.