As the Britney Spears PR Express rolls on, the singer revealed a sexy cover photo for her new album Circus Friday – plus the next single, called "Circus."

"The song is an up-tempo track," says the 26-year-old pop singer on her official site. "It's gonna be absolutely crazy!"

We're sure it is!

The CD, which has already produced the hit "Womanizer," which opens with a hot shot of Britney Spears nude and only gets better, drops December 2.

Here's the hot cover ...