Rihanna was not in the mood to greet fans as she and her mother exited their London hotel on the way to her concert in Sunderland, England. The troubled singer bashed a fan in the head with her microphone during a concert in Birmingham this week. The unprovoked attack came after the emotional fan held onto Rihanna's arm as the Bajan singer waded through the audience. The fan is reportedly considering filing a lawsuit against the rude girl, who is still bitter after being dumped by ex-boyfriend Chris Brown. Rihanna is currently on the European leg of her of "Diamonds" world tour.