They join previously announced performers Kenny Chesney, Coldplay, Jennifer Hudson, Jonas Brothers, Lil Wayne, Paul McCartney (with special guest drummer Dave Grohl of Foo Fighters), Katy Perry, Radiohead, T.I. and Justin Timberlake, Carrie Underwood, and Jay-Z, Lil Wayne, T.I. and Kanye West in a special performance of their hit single "Swagga Like Us."

Actor Simon Baker from CBS' "The Mentalist," actor/musician Jack Black, current three-time GRAMMY nominee Duffy, current nominee Josh Groban, three-time GRAMMY-winning jazz musician and current nominee Charlie Haden, actor Samuel L. Jackson and Academy Award-winning actress and current GRAMMY nominee Gwyneth Paltrow will appear as presenters.

Two-time GRAMMY winner Robert Plant and 21-time GRAMMY winner Alison Krauss have five nominations: Album Of The Year and Best Contemporary Folk/Americana Album for Raising Sand, Record Of The Year for "Please Read The Letter," Best Pop Collaboration With Vocals for "Rich Woman," and Best Country Collaboration With Vocals for "Killing The Blues."