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Sinead O'Connor isn't pulling any punches now that Miley Cyrus has responded to her open letter. 

In a new letter to the 20-year-old star, Sinead isn't taking kindly to Miley's decision to repost her old tweets from a time when she was suffering from mental illness.  Sinead said the decision to attack her cry for help from two years ago was even more "stupid than behaving like a prostitute and calling it feminism." 

Sinead also defended Amanda Bynes, who Miley had referenced in her tweets.  She adds that it is "most unbecoming" of Miley to attack someone who "expressed care" for her, asking "Have you no sense of danger at all?"  

Miley also posted the infamous photo of Sinead ripping a photo of the Pope.  She said that by mocking that photo, Miley is "mocking every child who suffered sexual abuse at the hands of priests." 

Here's Miley's response:

And the feud continued. Sinead indeed wrote another letter:

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