ABC/Eric McCandlessChaka Khan has canceled a series of July concerts, including a show scheduled for this Wednesday at the Stanislaus County Fair in Turlock, California, because she has entered a rehab facility to be treated for addiction to prescription pain medication.

A statement issued by the fair’s organizers reveals that, according to the R&B legend’s representatives, Khan voluntarily “entered an addiction rehabilitation and aftercare program which will cause her to postpone all dates scheduled for the month of July.” The message adds, that the singer “has struggled with a dependence” on pain meds and is attempting “to get healthy and stay that way.”

Stanislaus County Fair spokeswoman Adrenna Alkhas says in the statement, “We are extremely disappointed Chaka Khan canceled because we knew how much the community was looking forward to it, yet at the same time we wish her the best in her health and full recovery.”

Alkhas also reports that Jody Watley and Shalamar will perform in place of Khan this Wednesday. Watley has posted a message on her official website saying, “I’m keeping [Chaka] in my prayers.”

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