PREVIOUS APPEARANCES ON THE TIME 100: 0
PRO: Her caustic, catchy working-class anthem "Paper Planes" became 2008's flukiest hit single, despite its trigger-happy chorus. And her shimmying Grammy performance delivered just a few hours before she went into labor was a buoyant display of preg pride.
CON: "Planes" broke big thanks to a movie trailer not radio. And she needs to chill with the all-caps MySpace screeds.