Following rumors that Mariah Carey lip-synched her performance on Thursday night's episode of "American Idol," her rep has come forward to vehemently deny the speculation.
 
During the singing competition's season finale, Carey sang a medley of her greatest hits, including "Hero," "Vision of Love," "We Belong Together" and "Make it Happen."

Following her performance, many viewers went on Twitter and questioned whether she was singing live because it seemed that her lips weren't matching the words.
 
A user with the handle @entylawyer wrote, "Mariah Carey lip synched on a show where she ju...