Sinéad O'Connor is rumoured to be making an appearance on tonight's Late Late Show to talk about her war of words with Miley Cyrus.

Earlier this week O'Connor wrote an open letter to Cyrus after the pop star said her new video was inspired by the famous promo clip for Nothing Compares 2U.

In the letter, which was published on her website, O'Connor offered Cyrus advice and warnings about the dangers of the music industry but the 20-year-old lashed out at O'Connor on Twitter, taunting her and actress Amanda Bynes about mental health issues.

O'Connor has since penned two more letters and threatened legal action unless Cyrus apologises for mocking her and Bynes.

The Late Late Show is on tonight on RTÉ One.