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Christina Aguilera by Christina Aguilera

Breakout Track: "Genie in a Bottle"

Cue the pop princess war! Christina Aguilera's first album bowed in 1999, and it included hits like "Genie in a Bottle," "What a Girl Wants," and "Come on Over (All I Want Is You)." It's worth noting that Aguilera beat out Spears to win best new artist at the 2000 Grammys.

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