It looks like the pop industry is about to get divided.
TheFIX has learnt that Katy Perry believes Kesha's recent lawsuit against their joint manager Lukasz Gottwald, Dr Luke, is nothing more than "sourgrapes" due to her lack of talent.
In fact, the bubblegum pop star is said to be furious about Kesha's allegations that Dr Luke physically, verbally and sexually abused her before she entered rehab earlier this year.
In the lawsuit, filed in the hope of severing their current contract, Kesha claims that under his management she almost died. Pretty serious claims!
But our source says: "Katy Perry is his other most high profile person and it's perhaps no surprise she has sided with Luke. Well, she wouldn't have a hit without out him."
Our source also adds that when Kesha reached out, Katy, 29, disappointingly just ignored her.
"Kesha called Katy and made attempts at contact before she filed the lawsuit, but Katy didn't respond," the source explains.
"Kesha expected that reaction but is still trashing Katy for failing to acknowledging a machine that preys on young women desperate to make it big."
Earlier this year, as Kesha entered rehab for an eating disorder, reports claimed Dr Luke had previously pressurised her to lose weight, calling her a "fat f------- refrigerator".
And this week, Kesha filed her lawsuit, which claims: "For the past ten years, Dr. Luke has sexually, physically, verbally and emotionally abused [her] to the point where [she] nearly lost her life."
It's perhaps no surprise Dr Luke hit back immediately, saying the accusations are false and defamatory.
His lawyer said: "Kesha and her mother are engaged in a campaign of publishing outrageous and untrue statements about Dr. Luke to third parties, including scurrilous and false statements of purported physical and mental abuse of Kesha."
And Katy is now the first of the music industry to pledge alliance to Dr Luke, who has also worked with Christina Aguilera, Britney Spears and Pink.
The source: "But Katy blasts back that it's all just sour grapes because Kesha isn't talented."
We're predicting this is going to get very messy!