Do you remember when Miley Cyrus kissed Katy Perry at one of her Bangerz concerts and Katy pulled away? The infamous kiss seems to have started trouble between the two singers.

In a recent interview, Katy Perry said: "I just walked up to her to give her like a friendly girl kiss, you know, as girls do." She then explained that she was stunned when Miley put her tongue in her mouth. She added: "God knows where that tongue has been. We don't know. The tongue is so infamous!"

Miley fired back on Twitter. She wrote: "Girl if ur worried abt where tongues have been good thing ur ex boo is ur EX BOO cause we ALL know where THAT been." We hope they kiss and make up!