Oh boy:

Friends of Britney Spears have revealed the singer scrawled the devil's digits, 666, over her bald head and screamed "I'm the Antichrist" in rehab last weekend.

One pal told the News Of The World, "The clinic people just didn't know what to do. Then she started screaming, 'I'm a fake! I'm a fake!'"

The friend added, "Later that night she tried to kill herself. She attached a sheet to a light and tied it around her neck. Paramedics were called but luckily she was unhurt."

Does anybody know what kind of drugs she has been taking? A combination of acid and crystal? Or is she just crazy?