The 40-year-old actor`s wife Luciana Barroso is expecting her fourth child and Matt says the couple - who have two daughters, Isabella, four, and two-year-old Gia, together as well as Luciana`s daughter 11-year-old Alexis from a previous relationship - don`t want to add anymore members to their family.
He said: "My wife is about to have our fourth kid and we`ve drawn a line in the sand. This is it. Our lives are full and wonderful and we`re done havingkids. Lucy is in her third trimester for the fourth time and I think that`s about enough to ask of any woman. I don`t want to turn her into Ethel Kennedy!"
Ethel Kennedy had 11 children with her husband, late American Senator Robert F. Kennedy - the younger brother of assassinated US President John F. Kennedy.
The unborn tot is going to be another girl and Matt is determined to raise all his daughters to be "strong" women.
He added to Parade.com: "I think what`s important for kids to know is that your decisions here on earth matter, your behaviour matters, and how you treat other people matters. It matters here and I`m hoping that it matters in the afterlife, too. It just comes down to accountability for your own behaviour that`s important. So whenever I talk to my own kids, or whenever they ask, I try and put the hereafter in kind of an ethical framework. If I had a bucket list, I`d say raising my four girls to be strong, good women would be number one."