And the winner is… Janet Jackson, in a way. The 44-year-old singer graced the stage during the “American Idol” finale, giving this year’s hopefuls a memorable sendoff. The ESSENCE Music Festival headliner sang a moving rendition of “Nothing,” her song from Tyler Perry’s “Why Did I Get Married Too?” soundtrack. Immediately after, flanked by a male dancer, “Miss Jackson” turned things up in a tight black bodysuit while performing her classic hit, “Nasty.”