Katy Perry and Taylor Swift have only just reconciled after feuding for six years and another fight is already brewing.
Katy Perry, 33, is upset that Taylor Swift, 28, shared her apology letter to her with the public. Katy is believed to be angry about this because the introduction of the letter published on Instagram suggests Katy accepts "full responsibility".
A friend of Katy's told The Sun Online: "Katy expected that Taylor would post something about it. But she didn't expect the actual letter to go on social."
The friend adds: "The thing is, you can only see part of what Katy wrote and it looks like she's taking sole responsibility for the entire feud. Without context, it looks like she's taking the blame for everything and obviously there's a lot more to it than that."