Katy Perry is rumoured to be writing a hate-filled revenge song about her break-up with womaniser John Mayer, a new report claims.

Unlucky-in-love Katy has once or twice sung the bitter words of a break-up song before in the past, namely Ur So Gay, Peacock and Hot N Cold, but close friends of the singer have revealed that this one is just for the ears of the people close to her... For now, anyway.

A source close to the Teenage Dream singer told In Touch magazine: “This was Katy's form of therapy. She rips John a new one for making her think he wasn't the dog everyone claimed he was.”

This isn't the first time a source close to Katy has described the singer's turn to emotional lyrics as a 'form of therapy'. According to NME, another source close to the star described Katy's break-up from lothario Russell Brand as therapy too: “She has always said that writing is almost a form of therapy for her and she would often be found in her dressing room on tour writing in her diary.”

Katy's latest poison-spewing song is said to be called Feel Like A Fool, but the 28-year-old is worried about being compared to break-up song queen, Taylor Swift.

The close source revealed that for the moment, the song is for their ears only, but Katy has received such a positive response from the track that a public release could be in the cards.

Fingers crossed!

Originally posted by ElectricFrancis Looking for attention again, LOL.

Originally posted by ElectricFrancis Looking for attention again, LOL.

Katy Perry is rumoured

Originally posted by Mtjjproducer in what world is peacock a breakup song

The Queen is not worried about anything, she wrote "Circle The Drain" and had no mercy toward her ex-boyfriend.

Lmao, "Peacock" a break up song tho?

Dead @ the same Gaga stans rushing in here before us. The obsession.

Originally posted by Mtjjproducer in what world is peacock a breakup song

Originally posted by ElectricFrancis Looking for attention again, LOL.

Originally posted by pika Hanging yourself on stage and wearing a meat dress type of attention, or writing a break-up song which thousands of artists do type of attention? --- Can't wait to hear it. Sounds like it'll be a We Are Never Ever Getting Back Together part 2 if Max Martin/Dr. Luke produced it.

Originally posted by pika Hanging yourself on stage and wearing a meat dress type of attention, or writing a break-up song which thousands of artists do type of attention? --- Can't wait to hear it. Sounds like it'll be a We Are Never Ever Getting Back Together part 2 if Max Martin/Dr. Luke produced it.

Originally posted by Opacho Exactly what were you attempting with this? Both of those things were performances and the point was to get attention. Katy talks about wanting to keep her personal life and then turns around and does this? It's hypocritical.

Originally posted by Hunter_13 I'm ready for Katy's "Dear John"