Britney Spears is completely busy in the promotion of her new album Circus. She is having no fun , no play only work. "I feel like an old person now," she says 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."

Her Album is coming out on Dec. 2 - on her 27th birthday - with a live performance that day in New York City on Good Morning America. Her first single, "Womanizer," has been slowly climbing the charts, and Spears debuted the album's title track Tuesday on Elvis Duran's Z100 morning show in New York City. She is dedicated to work so very much that not even taking a break for Thanksgiving. The pop star boarded a plane Monday, headed to Europe to promote Circus overseas.

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