Ryan Seacrest, Katy Perry, Lionel Richie, Luke Bryan, Zach Shallcross

TV personality and "American Idol" host Ryan Seacrest; singers and "American Idol" judges Katy Perry, Lionel Richie and Luke Bryan; The Bachelor's Zach Shallcross after the finale; a performance from the cast of Bob Fosse's Broadway show "Dancin.'"