New Delhi: The Irish singer Sinead O'Connor has demanded an apology from the American star Miley Cyrus.Miley Cyrus who has been in news recently for all the wrong reasons has come under the scanner again. This time for mocking Irish singer Sinead O'Connor.According to reports, Sinead had posted an open letter to Miley on her website in which she expressed her concern for the Hannah Montana star. Sinead also mentioned that Miley was allowing herself to be "prostituted" by the music industry.But Miley responded by posting a screenshot of tweets from the year 2012 in, which Sinead , who has bipolar disorder, asked followers to recommend a psychiatrist. Not only this, but Miley also compared the Irish singer with former actress Amanda Bynes, who is undergoing psychiatric treatment.This has made Sinead really upset and she has demanded an apology from Miley.Miley, you better watch you words!