We're singing Happy Birthday to Britney Spears here at Sugar UK HQ, as the princess of pop turns 27 today. It's been a busy week for Britney, what with her performances in Germany, France and on The X Factor, so let's hope she gets to relax, while Circus no doubt flies off the shelves. To help celebrate Britney's big day, look back at her style with FabUK, and take my quiz to find out how well you know her.

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