Darren Criss' Blaine and Harry Shum Jr.'s Mike take center stage in "Wanna Be Startin' Somethin'." During rehearsals, Criss said, "I'm nervous I won't be able to do some of the moves, which are so iconic and cool."
Photo Credits: ROBERTO SCHMIDT/AFP/Getty Images; Jon Kopaloff/FilmMagic; Christopher Polk/Getty Images for NARAS; Courtesy of Warner Bros. Pictures, Courtesy of Warner Bros. Ent.; John Shearer/WireImage; Bob Mahoney/The CW; Paramount Home Entertainment; YouTube.com; Frazer Harrison/Getty Images