Janet Jackson has announced rescheduled tour dates after taking time to recover from an unspecified surgical procedure.

Janet Jackson attends the Giorgio Armani fashion show as part of Milan Fashion Week Womenswear Fall/Winter 2013/14 on February 25, 2014 in Milan, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)

The singer said Thursday the North American leg of her "Unbreakable" tour will resume May 14 in Las Vegas. Rescheduled shows include concerts in Portland, Oregon; Houston; Detroit; Atlanta; Washington; New York; Philadelphia and more.

Live Nation said tickets for previously announced dates will be honored at rescheduled shows.

Jackson said didn't offer details about her medical procedure earlier this month, but confirmed on Twitter that she did not have cancer.

The 49-year-old began the tour in August in support of her latest album, "Unbreakable." Before performing in North America again, she heads to Europe for shows in March.

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