Rihanna's turn to be cross with an overzealous admirer. As RiRi jumped from the Birmingham stage, she greeted fans as she belted out her hit We Found Love. Overcome with excitement, a fan reached out to grab the singer, and in return found himself being whacked around the head with RiRi's only weapon to hand, her mic. Another fan tweeted about the incident afterwards saying: "Rihanna just hit someone with her mic on accident haha oops." To which Rihanna responded: "Purpose! That ***** won't let me go." There have been no reports of any injuries to the fan, but the video is going viral. Watch it below.