Christina Aguilera walked into NBC's "The Voice" needing a serious career rehab. Though the pop diva was undoubtedly the biggest star on the panel, she seemed to be in serious trouble. Both her last projects -- the album "Bionic" and the film "Burlesque" -- bombed, and her personal life, including a divorce and arrest, became tabloid fodder. But within a few weeks on "The Voice," her star began rising again. Aguilera's duet with sparring partner Adam Levine on his band Maroon 5's "Moves Like Jagger," which premiered on the show, shot off and recently hit No. 1 -- the first chart-topper with her name attached to it in nearly a decade. How you know her: A graduate of the "Mickey Mouse Club" school of pop stars, Aguilera saw her big voice make her stand out among '90s teen queens such as Britney Spears, Jessica Simpson and Mandy Moore. She famously traded in her syrupy hooks and slinky dance moves for a pair of chaps and raunchy lyrics.
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