Not that The Sun is the most reputable UK tabloid, but they have some juicy Britney dirt:

An MTV source told The Sun: “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.”

Desperate lackeys at the glitzy Las Vegas Palms Casino resort fetched her doctor, who gave Brit the prescription drugs.

The source said: “Britney took enough to floor an elephant. They calmed her down — but were clearly too effective.”