Is Riihanna coming to Katy's defense against Taylor?

While Katy Perry has denied that she's working on a song to defend herself against Taylor Swift, it looks like she doesn't need to! That's because Katy's bestie Rihanna is planning on doing it for her. "Ri's protective of Katy and bugged by Taylor's growing good-girl clique," a source reveals. So, what type of tune is Ri planning on writing? "An aggressive club anthem with a video that's just as brutal as 'Bad Blood,'" the source continues. "It'll be very obvious that it's about Taylor. Rihanna's not worried, she knows Taylor's intimidated by her." Yikes, we kind of wish all of these girls would just give up the drama and get on the same team already!