Christina Aguilera, Carson Daly, and Chris Mann in The Voice (2011)

Christina Aguilera and Chris Mann in The Voice (2011)

Christina Aguilera, Carson Daly, Jesse Campbell, La Rosa, Blake Shelton, Moses Stone, and Lindsey Pavao in The Voice (2011)

Christina Aguilera, Leland Grant, and Hailey Steele in The Voice (2011)

Christina Aguilera, Leland Grant, Moses Stone, and Hailey Steele in The Voice (2011)

Christina Aguilera and Jesse Campbell in The Voice (2011)

Christina Aguilera, Jesse Campbell, La Rosa, Leland Grant, Moses Stone, Lindsey Pavao, Hailey Steele, and Geoff McBride in The Voice (2011)

Christina Aguilera and Blake Shelton in The Voice (2011)

Christina Aguilera, Carson Daly, CeeLo Green, Blake Shelton, and Adam Levine in The Voice (2011)

Christina Aguilera in Saturday Night Live (1975)

Christina Aguilera in Christina Aguilera: Stripped Live in the UK (2004)

Christina Aguilera, Pharrell Williams, Blake Shelton, and Adam Levine in The Voice (2011)

Christina Aguilera, CeeLo Green, Blake Shelton, and Adam Levine in The Voice (2011)

Cher and Christina Aguilera in Burlesque (2010)

Christina Aguilera, Britney Spears, and Justin Timberlake in The All New Mickey Mouse Club (1989)