You know Kid Sister used to split her time between pitching Red Stripes at a reggae bar, hocking lotion at Bath and Body Works and slangin' bibs at a baby shop? Now she's blowing up Hot 100s with prime rhymes over screwed samples co-produced by her big brother Flosstradamus and Kanye West. Crazy. Watch her literally go from rags to riches when the "Pro Nails" video premiere pops off, exclusively on mtvU.com.