GLEE: Amber Riley (Mercedes) performs in the Season Three premiere episode "The Purple Piano Project" of GLEE airing Tuesday, Sept. 20 (8:00-9:00 PM ET/PT) on FOX. ©2011 Fox Broadcasting Co. Cr: Adam Rose/FOX Glee

GLEE: Amber Riley (Mercedes) performs in the Season Three premiere episode "The Purple Piano Project" of GLEE airing Tuesday, Sept. 20 (8:00-9:00 PM ET/PT) on FOX. ©2011 Fox Broadcasting Co. Cr: Adam Rose/FOX Glee