Updated: 30 December 2013 19:45 | By Cat Collins
Young pop stars all grown up

Britney Spears



Britney Spears (© AP)
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Britney Spears has dazzled crowds and critics with the launch of her Las Vegas show, Britney: Piece of Me.

To celebrate the popstrel's debut in Sin City, we look back at other pop stars who've grown up before our eyes...

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