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The essential Britney Spears playlist

Flip through the slideshow below for 20 songs that are essential for any Britney Spears playlist, from her 1999 debut "Baby One More Time" to later favorites like "Till The World Ends." ...

40 photos that show how Britney Spears' style has evolved through the years

From the red carpet to performing on stage, Britney Spears has a long history of memorable outfits that have evolved over the years.