Miley Cyrus Mocks Sinead O'Connor, Who Fires Back in New Letter

Pop star compares Irish singer to Amanda Bynes

Miley Cyrus and Sinead O'Connor
Rob Ball/WireImage
Miley Cyrus, Sinead O'Connor.
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Miley Cyrus didn't take kindly to Sinead O'Connor's advice in an open letter not to let the music business "make a prostitute of you," comparing O'Connor to actress Amanda Bynes and tweeting a screen shot of the Irish singer's tweets from two years ago referring to her emotional health.

O'Connor responded with another open letter threatening legal action if Cyrus didn't "remove the tweets immediately." O'Connor wrote, "It is most unbecoming of you to respond in such a fashion to someone who expressed care for you," and chastised Cyrus for comparing her to Bynes, whose public behavior has been erratic in recent months. "In doing so you mock myself and Amanda Bynes for having suffered with mental health issues and for having sought help," O'Connor wrote.

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Cyrus also tweeted a picture of O'Connor ripping up a picture of the pope on Saturday Night Live in 1992. SNL is where Cyrus is spending this week, which she mentioned online.

"Sinead. I don't have time to write you an open letter cause Im hosting & performing on SNL this week," Cyrus tweeted, then continued, "So if youd like to meet up and talk lemme know in your next letter. :)"

O'Connor wrote her initial letter to Cyrus after the pop star told Rolling Stone that O'Connor's video for "Nothing Compares 2 U" helped inspire her recent "Wrecking Ball" clip, in which she swings around naked on demolition equipment.

"It is in fact the case that you will obscure your talent by allowing yourself to be pimped, whether it's the music business or yourself doing the pimping," O'Connor wrote. "It is absolutely NOT in ANY way an empowerment of yourself or any other young women, for you to send across the message that you are to be valued (even by you) more for your sexual appeal than your obvious talent."