By Bonnie Stiernberg Sky is blue, grass is green, Grimes has something embarrassingly out-of-touch to say about dating a billionaire. This time, it’s her assertion that her on-again, off-again boyfriend Elon Musk — who, with a net worth of approximately $223 billion, is currently the richest person on Earth — “lives at times below the poverty line.” The musician made the comment in a new, lengthy Vanity Fair profile, in which she also revealed that she and Musk are back together and had a secret second child together via surrogate. And while the baby news quickly went viral, it’s her remarks a…
