8. As the night went on, she slicked her hair back and wore a heavy, beaded floor-length dress. This image appears in the gallery:Every Outfit Jennifer Lopez Wore To The 2015 American Music Awards 8. 8. As the night went on, she slicked her hair back and wore a heavy, beaded floor-length dress. Picture: PA 10 images See the full gallery: Every Outfit Jennifer Lopez Wore To The 2015 American Music Awards