The "Bang bang" hitmaker, 27, took to Instagram to condemn the behaviour of some of her fans, and has revealed she's taken to unfollowing them because of their actions, reported Daily Mirror.
In a lengthy message, she wrote, "I don't usually comment on this topic, but I know some of my fans will notice so I want to explain.
"I have just unfollowed all of the 7/8 fan pages I was following on Instagram. Not because I don't want to, I love seeing what you find and post. But because I have been seeing some real nasty behaviour when I show some of the fans I follow love or repost them.