Kesha‘songoing legal battlewith Dr. Luke continues.

“On Feb. 26, 2016, [Kesha] sent a text message to Stefani Germanotta p/k/aLady Gagawhich repeated [Kesha’s] false claim that Gottwald had raped her,” Luke’s lawyer writes in the documents filed May 31.

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Dr. Luke’s legal team issued a statement to PEOPLE claiming Perry has denied the allegations.

A rep for Kesha’s lawyer declined to comment. Reps for Perry andLady Gagadid not immediately respond to PEOPLE’s request for comment.

In addition to co-producing Kesha’s breakout hits “TiK ToK” and “We R Who We R,” Dr. Luke also worked on a number ofKaty Perryhits, including “I Kissed a Girl,” “Teenage Dream” and “Roar.”

Perry — who no longer collaborates with Dr. Luke —told theNew York Timesof their professional split, “I had to leave the nest.”

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Kesha and the producer have been embroiled in a bitter legal battle since 2014, when Kesha sued her former mentor, alleging Luke had drugged andraped herand verbally and emotionally abused her for a decade.

Luke has vehemently denied the allegations and countersued Kesha for breach of contract and defamation. In February 2016, Luke tweeted: “I didn’t rape Kesha and I have never had sex with her. Kesha and I were friends for many years and she was like my little sister.”

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A judgedismissed Kesha’s abuse claimsin 2016, but the lawsuit rages on.

Kesha dropped her third album,Rainbow, last summer, though she is still tied to Luke through her recording contract with his company.

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In February, the singer took the stage at theGrammy Awardsto perform her empowerment anthem “Praying” in support of the Time’s Up movement with a star-studded choir, includingCyndi Lauper,Camila Cabello,Julia Michaels,Andra DayandBebe Rexha.

“I’ve taken ownership of myself. I’m taking control of my life and my name and the music it’s attached to,” Kesha toldCosmopolitanin the magazine’s June cover story.

source: people.com