On the cover of the Rolling Stone...

"I feel like an old person now," says Britney Spears in Rolling Stone's next issue, out Friday. "I do! I go to bed at, like, 9:30 every night, and I don't go out or anything."
Spears turns 27 on December 2, the same day her album, Circus, hits stores.
Interviewing the star is a "rigorously micromanaged process," according to Rolling Stone.
USA Today report HERE