21 million fans on Facebook, and rising, it’s the smile, it’s the struggle, Britney is a teen sensation. 15 years in the bright lights of fame, the harsh glare of public adoration and the ever-present danger of sliding into the mocking pens of jealous critics but still she carries on. Somehow she has survived the Michael Jackson effect of early success and now commands the respect of a new generation of teens. Since 2004, she has released 10 fragrances, adding up to 1.5 billion (yes, billion) in...