Earlier this week we reported the news of pop singer Kesha suing her longtime music producer, Dr. Luke, for sexual, emotional and physical abuse. The scandal continues to unfold, as the disturbing content of an email allegedly written by Kesha's mother, Pebe Sebert, was made public earlier today (Oct. 16).

The email, obtained by TMZ, was reportedly sent to Dr. Luke a year ago. In it, Kesha's mother appears to outright accuse the producer of having date-raped her daughter and threatens to publicly reveal the details -- claiming to have the support of big name celebs like Lady Gaga behind her. She wrote: "We, me and Kesha and her friends, like Lady Gaga, are going to make all of this Really PUBLIC, in the next few days. Luke date raped Kesha when she was 18. Nicky Hilton's birthday? Paris Hilton's house? Luke gave Kesha pills. She ended up naked in his hotel room 2 days later. No longer a virgin?"

Kesha's mom reportedly goes on to deliver an ultimatum -- either allow Kesha to break her contract or risk being exposed. She continues: "Do we all want this to come out? Either Luke releases Kesha from all legal contracts, and gives me back all my publishing, or we, Kesha and I, tell the truth."

Dr Luke is countersuing the 'Warrior' singer, claiming Kesha is simply trying to get out of a shoddy work contract. He also says she and her mother have already admitted the allegations are false, though proof of an admittance has yet to surface.

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