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Rihanna Reveals New 'S&M' Cover (PHOTO)

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Rihanna has been rocking red hair -- and now we know why.

The pop star unveiled the cover for her new single, the provocatively titled 'S&M' on Friday, tweeting out the photo for fans to check out -- and then go buy.

Along with the picture, she wrote, "Wassup crew? Need u guys to go get S&M on ITunes NOW! Let's go!!! #BOOM"

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