Former child star Miley Cyrus has apparently taken umbrage with Irish singer Sinead O'Connor's motherly advice not to 'prostitute' herself.
O'Connor's open letter to Miley was sparked by the 20-year-old's increasingly raunchy performances.
The 'Wrecking Ball' star has courted controversy for her racy lyrics, and videos where she appears nearly-naked.
In the open letter which appeared on O'Connor's website, she warned Cyrus not to allow herself to be taken advantage of -- and said her talents might be overlooked because she was allowing herself to be 'pimped' by the music industry.
O'Connor made the intervention after Cyrus said her new video, in which a single tear rolls down her cheek, had been inspired by the singer's famous 'Nothing Compares 2 U' video.
But Cyrus in turn took to Twitter to vent her frustration.
She tweeted a reference to Amanda Bynes, the troubled US actress, then a picture of a series of personal tweets written by 47-year-old Dubliner O'Connor. Among the tweets Cyrus posted were previous messages when O'Connor was telling how she needed to see a psychiatrist.
Last night, singer and 'Voice' judge Bressie joined in by tweeting: "Miley Cyrus's reply to Sinead O'Connor once again manages to reinforce the stigma on mental health."
In her letter, O'Connor said she was concerned about the approach to the music industry taken by Cyrus.
"I am extremely concerned for you that those around you have led you to believe, or encouraged you in your own belief, that it is in any way 'cool' to be naked and licking sledgehammers in your videos," wrote O'Connor.
"You will obscure your talent by allowing yourself to be pimped, whether it's the music business or yourself doing the pimping."