You know you’re a MAC girl for life when, while casually strolling around the neighborhood (six feet away from any neighbors, of course), you spy with your little eye a MAC eyeshadow brush from afar. See that!? Yeah, we were just taking a walk and, kid you not, I saw what looked like a makeup brush in the middle of the common area in our circle. My gut told me it was a MAC brush (note the black handle and…