Mariah Carey, R. Kelly Recording a Duet in Chicago

*In between her hosting duties for “American Idol,” Mariah Carey found time to tweet that she is working on a duet with fellow R&B star R. Kelly.

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Along with a photo of them sharing a microphone, Carey told fans today that they met up in a recording studio in Chicago to collaborate.

“Me and Kells in the lab in Chi town working on a new song! Omg – his voice sounds A++,” she tweeted.

She added that his “Trapped in the Closet” hip hopera  is a “total classic.”