01/22/2011 10:04 am ET | Updated May 25, 2011

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

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"