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Sinead O'Connor just can't shut up! Yesterday, the "Nothing Compares 2 U" singer wrote an open letter to Miley Cyrus, urging her not to let the music industry "prostitute." Subsequently Miley blasted the Irish songstress on her Twitter comparing Sinead's twitter feed to Amanda Bynes', and now Sinead has fired back with not one but TWO open letters in which she threatens taking legal action against Miley even she doesn't apologize for the slam. All aboard the Sinead O'Connor to Crazytown!

"You can take five minutes today between g- string f***ing changes to publicly apologise and remove your abusive tweets. If you do not then you don't give a s**t who you mock and what damage you do by being so ignorant," ranted Sinead.

Hey Sinead O'Rebellion why don't you just do yourself a favor and stop talking?

After Sinead's original open letter, the "Wrecking Ball" singer posted tweeted, "Before Amanda Bynes… There was…" and then posted a screengrab of Sinead’s old Twitter account in which wrote a bevy of bizarre tweets including ones asking for psychiatric help.

Sinead retaliated when she posted a note on her Facebook entitled "ANOTHER OPEN LETTER TO MILEY CYRUS," in which Sinead warned Miley that challenging her is, "even more f*****’ stupid than behaving like a prostitute and calling it feminism."

Sinead also came at the "We Can't Stop" singer for knocking both her and Amanda’s public breakdowns, writing: "You have posted today tweets of mine which are two years old, which were posted by me when I was unwell and seeking help so as to make them look like they are recent. In doing so you mock myself and Amanda Bynes for having suffered with mental health issues and for having sought help."

Hmm while we agree mocking the mentally ill is not cool, but neither is attacking people in "open" letters for all to see. If Sinead really wanted to get through to Miley, she could have figured out a way to send her the original (seemingly well meaning) letter privately. But apparently that wouldn't garner enough attention.

Click thru to read Sinead's two new open letters ...