Britney Spears's career has been a wild ride. The pop princess started off sweet, then sexy, then troubled, and then made an epic comeback. Oh, and there was the K. Fed phase, as well. In celebration of her Vegas residency, her new album, and her two-hour E! documentary, we're giving you all the Britney goods from the past two decades. Don't call it a comeback, she's been here for years.
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