Rapper Mac Sauce totally knows how to break it down, even though she is only 7 years old. The Missouri girl wrote her own lyrics to rapper 6ix9ine's "Stoopid" and performed them at a back-to-school event. After her dad posted the video, people around the world couldn't believe her skills. And for her part, Mac is excited and amazed by her new fans. "It felt like more people now know me and like listening to my music, like even grown-ups, so I'm like, wow!" she told InsideEdition.com.