The Academy Award winning actor, who already has two sons Charlie, three, and Tennyson, one, said that he and his wife might now try for a daughter.
"You'll have to ask the wife. It's under negotiations," Bang! Showbiz quoted him, as telling the Daily Telegraph.
The actor, who is raising his family at his sprawling property near Coffs Harbour on the New South Wales north coast, also said that while he is earning in millions, he is determined to keep his children grounded.
"My kids are being raised in a much more affluent environment than was mine. My wife and I talk about that all the time because neither of us had this kind of experience," he said.