Usher & Jennifer Hudson Rehearse for Michael Jackson Tribute

Celine Dion, Smokey Robinson, Jennifer Hudson, Usher, and Carrie Underwood sported 3-D glasses during rehearsals for the 52nd Annual Grammy Awards at L.A.’s Staples Center on Saturday (Jan. 30). The artists will pay homage to the King of Pop at tomorrow’s show. The tribute also features the premiere of Michael Jackson’s “Earth Song” mini-movie in 3-D.