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Christina Aguilera's changing looks

By Gena Oppenheim Slide 1 of 17

Christina Aguilera has come a long way since she hit the pop music scene as a fresh-faced teen in the late '90s. While her larger-than-life voice hasn't changed a bit over the years, we can't say the same about her style. In honor of the "Lotus" singer's 33rd birthday on Dec. 18, click through to see her drastically changing looks! In 1999, Christina Aguilera rubbed almost everyone the right way with her debut single "Genie in a Bottle." Her midriff-baring style was a bit risque for her tween fans, but the then-18-year-old star still managed to keep her outfit choices toned-down enough to maintain a good girl persona … for a while, at least!
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