Singer, songwriter, performer, producer, and performer — is there anything Christina Aguilera hasn't done? One of the most accomplished performers of the last decade, she has sold more than 25 million albums worldwide, achieved four #1 singles on the Billboard hot 100 chart, and has won four Grammy Awards and a Latin Grammy Award, as well as two top five albums in the United States. She has collaborated with other great artists including Herbie Hancock, Andrea Bocelli, Sean "Diddy" Combs and most recently, the legendary Tony Bennett.