Work is progressing on Madonna's next studio album, although details are scant at deadline. "If you haven't heard that Madonna is back in the studio recording, then you might be living under a rock,"

Work is progressing on Madonna's next studio album, although details are scant at deadline. "If you haven't heard that Madonna is back in the studio recording, then you might be living under a rock," a statement on her official Web site says. "Madonna is busy in the studio collaborating with new producers that she has never worked with before."

At deadline, it was unknown when the as-yet-untitled album would be released, or with whom Madonna was working.

The set will be the follow-up to 2003's critically maligned album "American Life," which debuted at No. 1 on The Billboard 200, but posted the lowest sales of any Madonna album to-date (656,000 copies in the United States, according to Nielsen SoundScan). In contrast, 2000's "Music" has shifted more than 2.89 million units.

Although it didn't fare well at retail, "American Life" spawned the massively successful Re-Invention tour, which grossed $125 million in box office receipts, according to Billboard Boxscore. "My Re-Invention tour was by far the most creatively satisfying experience I have ever had," Madonna told Billboard in December. "I was able to put everything I love into one entertaining event: film, music and dance."

As previously reported, a DVD chronicling Re-Invention is due by the end of the year.