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Ah, the shave heard 'round the world. In the midst of a psychological breakdown in February 2007, the pop star checked out of rehab, hit up a hair salon and buzzed off all of her hair herself. If that wasn't enough of a cry for help, newly bald Brit proceeded to get a tattoo and attack a paparazzi car with an umbrella. It would be another 11 months before she was put on a psychiatric hold and placed under a conversatorship, which still stands today.