It's no surprise that daddy-dom hasn't changed Matthew McConaughey's free-spirited ways. On CNN's House Call with Dr. Sanjay Gupta, the proud papa talks about how 1-month old son Levi is already out and about in the world. "We took Levi to a John Mellencamp concert," reveals Matthew. "Everyone talked about how, 'Oh, you have a kid, life changes, it's like 180 degrees on a dime full stop, wow.' And a lot of them had an insinuation under that like, you have to stop living your life as you live it. That hasn't been the case." Matthew's parenting secret? It "takes a little more prep time to do whatever it is you're going to do," he admits.