© (L) Twitter / MagdaDavitt77; (R) YouTube / discodelirio
In a tweet disclosing her new religious beliefs - as well as her new name - O'Connor said that she was "proud to have become a Muslim," and that accepting Islam as the true faith is "the natural conclusion of any intelligent theologian's journey."
Her decision was met with countless congratulatory tweets from fellow Muslims, with many welcoming her to the "Ummah" - the Arabic word used to describe the global Islamic community.
But not all responses were positive. Some criticized her decision, describing O'Connor's new faith as backwards and anti-women.
"So you are now supporting a religion that segregates women, and that teaches that women are inferior?" One disappointed netizen asked.
"I'm an ex-muslim. You missed that part of Quran that says women are worth half a man in witness, blood money and inheritance. Theology failed!" wrote another.
Others theorized that the announcement was simply a cry for attention.
O'Connor, whose popularity peaked in the 90s, is best known for her rendition of "Nothing Compares 2 U." In 1992, she ignited a fierce debate about freedom of speech and religion after tearing up a photograph of the Pope during an appearance on American sketch comedy show Saturday Night Live.
The stunt was in protest against sexual abuse in the Catholic Church - a subject that was still taboo at the time. She was later ordained by a breakaway sect, although the Catholic Church did not recognize the ceremony. She claims she was excommunicated from the Church for this by Pope Benedict XVI in 2013 and demanded proof of the fact.
The singer has exhibited some rather erratic behavior over the years. In 2000, she announced that she was a lesbian, but amended her sexuality several years later to "three-quarters heterosexual, a quarter gay."
She also has a history of mental health issues and claims to have been suicidal.
This is not O'Connor's first name change: Last year she legally changed her name to Magda Davitt.
Shuhada, Napoleon, Joan of Arc. Let's face it only a nut-house would have her.
"Sister, our Ummah is honored to have you. Let me know how we can help you on this beautiful journey."
R-i-g-h-t.
All women at some stage have to come to terms with not being quite so young and gorgeous as they were at 21. It seems to me O' Connor has been unable to shake off a highly debilitating state of identification with the 'saintly-appearing' graven image concocted for the video of her really annoying platinum-selling version of Prince's "Nothing Compares 2 U" and will continue to be an embarrassing ar*ehole, doomed to crawl through endless fields of existential barbed wire until she is able do so.