Lionel Richie and Hunter Hayes will also perform on the Brooklyn Bridge stage
Carrie Underwood wins top honors, while Florida Georgia Line and Luke Bryan each take home two trophies
Kevin Hart and Tracy Morgan are also set to appear at the event on June 29
Only Sugarland's Jennifer Nettles cuts through the smooth-pop clutter in their duet on "Hello"
Yep, that's right, pardner … Lionel Richie's a country singer now, dueting with Blake Shelton, Rascal Flatts, Kenny Chesney
New big-name "advisers" will augment the show's coaches, lend their expertise to show's aspiring singers
Mike Medavoy and Queen Noor share the stage and Uma, Julianne, Rose and the 'Fear Factor' gang hit the party circuit
Following in the footsteps of Smash Mouth and Eddie Murphy, Weezer has covered The Monkees' "I'm a Believer"