"The 46-year-old singer posted a third open letter to Miley, 20, on her Facebook page accusing her of causing 'enormous distress, harassment and the potential to damage my career'.
And in response to Miley's previous invitation to meet up and discuss the argument in person, Sinead wrote: 'I have no interest in or desire to cause you trouble but if you do not apologise for having deliberately tried to cause me hurt and trouble personally and professionally I will have to bring pressure upon you.
'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.'
It just began people!
culled from dailymail.co.uk