Miley fires back at Sinead O'Connor

Miley Cyrus fired back at Sinead O'Connor today on Twitter, tweeting that the Irish singer had...

Miley Cyrus fired back at Sinead O'Connor today on Twitter, tweeting that the Irish singer had mental problems before she or Amanda Bynes did, referring to an old 'Saturday Night Live' sketch where the singer ripped up a poster of the pope.

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, Last Updated: 6:39 PM ET

Miley Cyrus has responded to an open letter addressed to her and posted online by Sinead O'Connor, by alerting fans to the Irish singer's mental health issues.

Irked by Miley's claims in a Rolling Stone interview that her new video for 'Wrecking Ball' was inspired by her Nothing Compares 2 U promo, O'Connor penned a lengthy ode to the 20 year old, urging her to stop prostituting herself on film.

The Irish star also expressed her fears and concerns that Miley was being pimped and exploited by her handlers.

Cyrus has now fired back by comparing O'Connor to troubled actress Amanda Bynes, who is currently seeking treatment in rehab following a reported mental health crisis.

Posting a screen grab of the worried Irish star's Twitter letter, Miley writes, "Before Amanda Bynes... There was..."

She has also posted a photo of Sinead ripping up a photo of the Pope as part of a headline-grabbing protest during a 1992 appearance on U.S. comedy show 'Saturday Night Live', which Miley will host this weekend.


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