Britney Spears was busy last week with performances of her hit single Womanizer and her new song, Circus. She then celebrated her 27th birthday on GMA, later attending the Christmas tree lighting at Rockefeller Center and then on Friday, flipped a switch on L.A. Live's first holiday display. All the while, the pop star look awesome, especially her hair, which as we all know, over the past year, wasn't always so pretty.
More pics and video after the jump!
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