"He called me on Sunday afternoon and said, 'I made a little baby girl,' " reports Rooster. "He's all proud ... He's got it going on now."
Upon learning that Matthew is now the father of both a boy – 18-month-old Levi – and a girl, Rooster jokingly told his little brother "to quit copying me. You're paralleling me. Hell, we've got so many McConaughey girls now, we're all gonna have to learn volleyball and cheerleading."
Rooster, who is also the father of a son and a daughter, claims he isn't surprised that Matthew, 40, and Camila decided not to name their newborn after a booze, as their children's cousins are.
"I think I ruined it for him because I've already taken up that territory," Rooster says laughing. "I named my [3½-year-old] boy Miller Lyte because that's my favorite beer. And my [11-month-old] little girl is named Margarita Olympia ... I liked that beer, too, even though they don't even make it anymore."