“He called me on Sunday afternoon and said, ‘I made a little baby girl,'” Rooster tells People. “He’s all proud… He’s got it going on now.”
He also weighed in on his newborn niece’s name, saying that booze-inspired names are more his style than they are Matthew’s.
“I think I ruined it for him because I’ve already taken up that territory. 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.”
In a show of friendly brotherly competition, Rooster says he told Matthew to “quit copying me” when he heard the news that he’s now the dad of a daughter.
“Hell, we’ve got so many McConaughey girls now, we’re all gonna have to learn volleyball and cheerleading,” he jokes.
Matthew and Camila are also parents to 17-month-old son Levi.