Charlotte Church's priest is taking legal action against the now defunct News of the World.Father Richard Reardon's lawyers said they have enough evidence to prove that jailed private investigator Glenn Mulcaire hacked the Roman Catholic priest's phone.
The latest revelations will be a major blow to Rupert Murdoch's News Group Newspapers after attempts to limit the public backlash following the phone hacking scandal.
Father Reardon, from the archdiocese of Cardiff, was a close confidant of the Church family particularly during the period of 2002 to 2006 when hacking was believed to be rife at the newspaper.
The Metropolitan Police revealed the priest was listed in one of Mulcaire's notebooks under the 'family and friends' section of those connected with the Welsh singer.
Last month Church accepted compensation of £600,000 from News International and said that she was 'sickened and disgusted' by the newspapers actions.
She added 'they are not truly sorry, only sorry they got caught'.
Speaking after the payout she said: 'Nothing was deemed off limits by those who pursued me and my family, just to make money for a multinational news corporation.'
According to the Independent newspaper, News International's leading counsel, Michael Silverleaf, told a pre-trial review the corporation would dispute any claim that information contained and published in articles came from listening to Father Reardon's voice messages.
Mark Thomson, who has been hired by the priest, is also representing Sienna Miller and Jude Law.
He told the Mail Online today: 'I can confirm that we [Father Reardon and I] are acting but no, we are not commenting.'
Mulcaire was jailed in 2007 for illegally accessing mobile-phone messages.
The phone-hacking scandal has led to a series of large pay-outs, as well as the News of the World’s closure.
In total, more than 50 phone hacking cases have been settled, with the majority of victims receiving between £25,000 and £30,000.
Among the bigger payments, the family of murdered schoolgirl Milly Dowler are said to have received £3million.
Such deals mean the £20million fund put aside by News Group Newspapers for settlements may need to be topped up.
More than 800 victims of phone-hacking have been identified by Scotland Yard since it launched Operation Weeting, a fresh investigation into the practice, last year.