Not since Sinead O'Connor has a crew cut on a woman spark such controversy. But when Britney took out the clippers, it wasn't so much a political statement as it was a signal that she had simply gone bats**t crazy. Visits to rehab centers, a disastrous VMA performance and the custody loss of her two sons followed, all of which accelerated the rapid and very public decline of the once untouchable pop star. For a while, her antics threatened to eclispse her hits, but a late-decade resurgence in the form of a chart-topping album, a successful world tour and record-breaking single has put Britney back on top one more time.