Miley Cyrus has hit back at Sinead O'Connor in an escalating online war of words and invited her to a face-to-face chat to air their differences.
The offer of a meeting came after the Irish singer said she was "extremely concerned" about the US singer's Wrecking Ball music video and warned her not to be exploited by the music business.
But Cyrus responded by mocking the Nothing Compares 2 U singer in a series of Twitter posts, including a screenshot of a 2012 tweet when O'Connor had asked her followers to recommend a psychiatrist.
Cyrus tweeted: "Sinead. I don't have time to write you an open letter cause I'm hosting and performing on SNL this week. So if you'd like to meet up and talk lemme know in your next letter."
O'Connor suggested she would sue the Hannah Montana star if she does not apologise publicly or remove the tweets.
"I have no interest whatsoever in meeting you. You had plenty of time yesterday to abuse (me)," the 46-year-old wrote.
David Cameron has not discussed the Miley Cyrus-led dance craze of "twerking" with his nine-year-old daughter yet, saying it is hard to protect children "from bad examples and bad role models".
The Prime Minister told The Sun (£): “I haven’t discussed twerking with Nancy yet, because I don’t think she has seen the video. Luckily, she was interested in Hannah Montana, but then stopped.
"But I think we are all struggling our way through this. How do we, as parents, let our children watch the television, look at things on the internet, while protecting them from bad examples and bad role models?
"I don’t think there’s a simple answer. It is something Samantha and I talk about all the time."
Cyrus reportedly said: "I don't pay attention to the negative because I've seen this play out so many times.
"How many times have we seen this play out in pop music? Madonna's done it. Britney's done it. Every VMA performance, that's what you're looking for; you're wanting to make history."
The 20-year-old singer was speaking in a video on MTV.com, cannot be viewed in the UK.
Cyrus did not take home any awards on the night but almost stole the show with her raunchy duet alongside Robin Thicke, who was performing his hit "Blurred Lines".
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Singer Miley Cyrus has announced she is engaged to Hunger Games actor Liam Hemsworth. The 19-year-old told People magazine: 'I'm so happy to be engaged and look forward to a life of happiness with Liam."
Earlier she tweeted:
I love you more today than yesterday but I love you less today than I will tomorrow....
life is beautiful