It’s the celebrity feud that just keeps on going. The Bad Blood between Taylor Swift and Katy Perry looks to be here to stay… and neither pop star is doing anything to repair the damage. A week after her sub-tweeting about Taylor hit the headlines, Katy Perry has yet again used social media to reference her long-running rift with the Shake It Off singer. Katy, who boasts 25 million followers on Instagram only follows 202 people on the photo-sharing app – many of them fellow celebrities like Daphne Guinness, Miley Cyrus and Lily Allen. As of Monday morning, however, Katy is also following a user by the name of “sluttytaylorswift”. The page does not have any direct connection to Swift, 25, but the move was quickly noted by both sets of fans, coming as it does after Perry inserted herself into a disagreement between Taylor and Nicki Minaj. The next twist in the story comes in the wake of claims that Katy’s pal Rihanna is planning a “revenge” song about Taylor in support of her pal. OK! Magazine reports that Rihanna has tired of Swift’s good girl image and was not impressed with the lyrics and video for Bad Blood – widely believed to be about Katy. https://www.youtube.com/watch?v=QcIy9NiNbmo