Mariah Carey

NEW YORK (CNN) -- Singer Mariah Carey, hospitalized last month for exhaustion, has canceled a scheduled prime-time interview in which she was to discuss her breakdown.

Cindi Berger, a publicist for Carey, said the interview was "postponed" because the singer "needs more time to rest." Berger refused to say whether Carey had been re-hospitalized.

Carey's interview with ABC's Barbara Walters was scheduled to air on the news program "20/20" on September 12, the day after her newest album, "Glitter," was to go on sale.

"We were concerned to hear that Ms. Carey would be unable to do the interview at this time, and we wish her well," Walters said, according to an ABC Web site.

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Carey, 31, checked herself into a hospital July 26 for "extreme exhaustion." Her publicist cited the singer's recent work in completing two movies, "Glitter" and "Wise Girls," while simultaneously writing, recording and producing the "Glitter" soundtrack album.

The Grammy-winning singer made her debut in 1990, and has released nine albums on the Columbia/Sony label, selling more than 150 million singles and albums worldwide.

In April, she left the Columbia/Sony label for the Virgin label.