Mel Gibson to be a father again?

Actor-filmmaker Mel Gibson's girlfriend Rosalind Ross is reportedly pregnant.

According to a report, the 59-year-old, who already has seven children with former wife Robyn and daughter Lucia, six, with former girlfriend Oksana Grigorieva, is expecting his first child with Ross, who he has been dating since July.

The report said that Ross, 24, who is former equestrian star-turned-aspiring screenwriter, sparked speculation among her friends when her behaviour changed a month ago.

"Rosey suddenly gave up drinking about a month ago. And while she won't admit she's pregnant, she's not denying it either," a source was quoted as saying by Australia's New Idea magazine, reports femalefirst.co.uk.

Ross is Gibson's first girlfriend since he split from Grigorieva in 2010, and since they got together, they have enjoyed spending time together away from the public eye at both his estate in Costa Rica and on vacation in Panama.

"It's clear the two of them are really happy together...Mel hasn't had the best luck with the ladies. He's in no rush to turn his relatively new romance into a high-profile affair," the source said.