O'Connor plays down feud during appearance on last night's Late Late Show - insisting Miley Cyrus is a "great artist".
O'Connor, appearing on 'The Late Late Show' and giving the world the first public glimpse of her new cheek tattoos, said she was "no role model" despite her offering of "motherly advice" to US popstar Miley Cyrus which had sparked the vitriolic spat.
"I'm not pitching myself as a role model for anyone by a long shot or a perfect person," she said last night before adding she felt sorry for Amanda Bynes, the troubled US actress Cyrus had compared to O'Connor.
"I was upset on behalf of Amanda Bynes, not for myself. I'm used to it.
"I thought it was a nasty thing to do. She had nothing to do with the conversation and also the poor girl is in hospital receiving treatment for the very illness she's being knocked for having.
"It was a very nasty time to expose a girl but I doubt Miley is a person who sat down and maliciously thought that I want to hurt Amanda Bynes.
"We're all human and we all do things off the cuff."
But she paid tribute to former children's TV star Cyrus insisting she liked her music.
"I think Miley is a great artist, that's not what this is about. I like her songs and think she is a brilliant artist."
The war of words began when the 20-year-old US singer cited O'Connor's famous 'Nothing Compares 2 U' song as inspiration for her new 'Wrecking Ball' video in which she appears naked.
O'Connor wrote an open letter to Cyrus "in the spirit of motherliness" warning the star not to allow herself be prostituted by the music industry.
Cyrus responded to the letter on twitter by comparing O'Connor to Bynes and posting a picture of tweets sent by the 46-year-old Dubliner two years ago where she said she needed to see a psychiatrist.
She also tweeted a photo of O'Connor infamously tearing up a photo of Pope John Paul II live on US television.
O'Connor then penned her second open late on Thursday night, calling on Cyrus to apologise for insulting people suffering from mental illness and threatened legal action if she did not remove the tweets.
The feud intensified when Cyrus responded, again on Twitter, stating she was too busy working on the 'Saturday Night Show' in the US to write an open letter back to O'Connor.
"So if you'd like to meet up and talk lemme know in your next letter," she tweeted.
O'Connor said she had no intention of meeting the 'Wrecking Ball' star and in a third open letter repeated her intention to pursue legal action if Cyrus does not apologise for her remarks.
She said Cyrus wouldn't dare mock her idol, Britney Spears, for her documented mental health difficulties several years ago.
"How do you feel when your friend Britney Spears is mocked and humiliated for having had mental health problems? I know I personally want to bash those who treat her that way."
Shortly afterwards Cyrus tweeted a line from 'Nothing Compares 2 U' in response: "I went to the doctor guess what he told me, guess what he told me. He said girl you better try to have fun. No matter what you do."
"They've murdered music and that is what this is about.
When interrupted by presenter Ryan Tubridy who said Cowell and Walsh would be upset to be referred to as murderers, she quipped: "I don't give a s**t".