Miley Cyrus and Sinead O’Connor are at it again. The controversial 46-year-old Irish singer, blasts Cyrus for mocking her mental illness.

On Thursday, Sinead O’Connor wrote an open letter to Miley Cyrus, “The music business doesn’t give a s*** about you, or any of us.” she wrote,“They will prostitute you for all you are worth, and cleverly make you think it’s what YOU wanted …and when you end up in rehab as a result of being prostituted, ‘they’ will be sunning themselves on their yachts in Antigua, which they bought by selling your body and you will find yourself very alone.” 

The twerking sensation, Cyrus, then responded with this tweet “Before Amanda Bynes…. There was….”

Before Amanda Bynes…. There was…. pic.twitter.com/6JZPVnunPc

— Miley Ray Cyrus (@MileyCyrus) October 3, 2013

The tweet compares Sinead O’Connor to Amanda Bynes, both of whom have been treated for psychiatric problems. As to be expected, this prompted yet another heated open letter by O’connor via Facebook. Sinead’s new letter to Miley, calls  Cyrus’ tweets ‘anti-female’, ‘irresponsible’,  ‘dangerous’, and ‘f***ing stupid’.

“Miley… Really? Who the f**k is advising you? Because taking me on is even more f**kin’ stupid than behaving like a prostitute and calling it feminism. 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,” O’Connor wrote. She then threatened legal action against Cyrus if the tweets were not removed and urged Cyrus to apologize to her and all the people that suffer from mental illness.

After reading O’Connor’s response, the 20-year-old Pop singer tweeted, “Sinead. I don’t have time to write you an open letter cause I’m hosting & performing on SNL this week.”

Sinead. I don’t have time to write you an open letter cause Im hosting & performing on SNL this week.

— Miley Ray Cyrus (@MileyCyrus) October 3, 2013

The SNL (Saturday Night Live) reference seemed to be a slight jab, considering O’Connor was banned from the comedy show for ripping up and image of the Pope on live TV, in 1992.

Cyrus then extended an invitation for them to meet up and talk about the issue.

Chances are there will be more jabs and low blows to come from these two.  Let’s see if there’s another round.

(photo via billboard)