Last week, Kesha's attorney Mark Geragos publicly alleged that Dr. Luke had raped Lady Gaga on Twitter.
Even though both Gaga and Luke's representatives have vehemently denied these allegations, Geragos has stuck by them.
"I said it because it’s true," Geragos told TMZ.
Now, the producer is suing Geragos for defamation and calls the statements made against him "maliciously false."
The summons asserts that Luke had never met Gaga nine years ago — when the assault allegedly took place — and that he had "never been alone with her" and had "never touched her". It also details that Luke had only met her twice "for very brief periods of time."
Luke is seeking damages in amounts that have yet been determined.