1. Jennifer Lopez Leaps Onto Hot 100 with 'On the Floor'

    March 03, 2011 11:44 AM EST 0 0 0 J ennifer Lopez blasts back onto the Billboard Hot 100, as "On the Floor," featuring Pitbull , soars in as the Hot Shot Debut at No. 9, marking the new "American Idol" judge's highest career launch on the list. Lopez's ...