Britney Spears leaving the Luxor Hotel. Las Vegas, Nevada - 10.09.07

The tormented pop star angrily disapproved of the chosen hairstyle for her comeback at the Las Vegas ceremony and flew into "blind panic", according to reports.

A doctor was dispatched to the Palms Casino resort to give the star prescription drugs.

A source tells British newspaper The Sun, "Britney took enough to floor an elephant. They calmed her down, but were clearly too effective.

"The scene in the dressing room before the show was one of absolute blind panic.

"She knew she hadn't rehearsed enough and was going to mess up the whole show and possibly her career - then she saw her hairdo and it was the final straw.

"She went into a wild rage and started lashing out at everyone - including her stylist."

Source: WENN