Oh, it's on, all right. Here's the latest in the Miley Cyrus-Sinead O'Connor saga:
After O'Connor published on her website an open letter to the 20-year-old pop star, in which she urged her not to "prostitute" herself, on Thursday, Cyrus tweeted a screenshot of the 46-year-old Irish singer's 2012 public plea for psychiatric help, referencing troubled fellow former child star Amanda Bynes.
She also posted a picture of O'Connor's 1992 "SNL" performance, in which she ripped a photo of the Pope to protest suppression of evidence of sexual abuse of children by clergymen.
O'Connor later posted more responses to Cyrus on her website and Facebook page, while Cyrus responded to her on Twitter.
Sinead O'Connor's 2nd letter to Miley Cyrus
The singer threatened to sue Cyrus for posting the screenshot of her 2012 tweets and called her a "danger to women."
"Who advises you?" she said. "Have you any idea how stupid and dangerous it is to mock people for suffering illness? You will yourself one day suffer such illness, that is without doubt. The course you have set yourself upon can only end in that, trust me."
"Remove your tweets immediately or you will hear from my lawyers," O'Connor said.
Cyrus' screenshot of the Twitter message remains online as of Friday morning, Oct. 4, a day before the singer is set to host and perform on "SN: and four days before her new album "Bangerz" will be released officially (after being streamed online earlier this week).
"It is not acceptable to mock any person for having suffered," O'Connor said. "It is most unbecoming of you to respond in such a fashion to someone who expressed care for you. And worse that you are such an anti-female tool of the anti-female music industry."
"I hope that you will apologize to Amanda Bynes and to any person who has been wounded by your mockery of those who have suffered," she added. "And I hope that you will wake up and understand that you in fact are a danger to women."
O'Connor also said that she is currently "quite well and kindly request people cease emailing me in the mistaken belief these are recent tweets" and that "mockery" is deadly and "an unacceptable form of bullying, no matter who it is doing the bullying."
Miley Cyrus' response after Sinead O'Connor's 2nd letter was posted
The singer tweeted: "Sinead. I don't have time to write you an open letter cause Im hosting & performing on SNL this week. So if youd like to meet up and talk lemme know in your next letter. :)"
Sinead O'Connor's third letter to Miley Cyrus
"I have no interest whatsoever in meeting you," O'Connor wrote in a Facebook post on Friday. "You had plenty of time yesterday to abuse Amanda Bynes .. an entirely innocent party.. and myself.. who also did nothing to deserve your abuse.. along with every other sufferer of mental health problems and every person who suffered abuse at the hands of priests."
"When you publicly apologize to Amanda and myself and all mental health sufferers as well as all who were abused by priests that will end the matter as far as I am concerned," she said, adding: "If you cannot apologize I will have no choice but to bring legal proceedings against you since it is extremely hard to be given work when people think one is suffering from mental illness."
O'Connor said she had no interest in causing Cyrus trouble but that she would "have to bring pressure" on her if she did not apologize" for having deliberately tried to cause me hurt and trouble personally and professionally."
"When you end up in the psych ward or rehab I'll be happy to visit you.. and would not lower myself to mock you," she added. "Cease behaving in an anti-female capacity. You will become the victim of it shortly. Soon it will be you the media 'crazy' .. and you will not enjoy it.. and you will appreciate people (like myself) standing up for you. Which I will be happy to do.. if you earn my respect today by apologising publicly."
(Pictured above: Sinead O'Connor performs at the Auditorium Parco in Rome, Italy on April 7, 2013. / Miley Cyrus talks to OTRC.com at the Maxim Hot 100 women event on May 16, 2013. She was deemed the magazine's "Hottest Woman." (Watch VIDEO).