Heather Mills believes her phone was hacked by a Mirror Group newspaper, the BBC reported on Wednesday.
Sir Paul McCartney's former wife told the BBC's Newsnight programme a senior figure, who they have not named, admitted that they had listened to her voice messages.
Mills said she told the figure "You've obviously hacked my phone and if you do anything with this story ... I'll go to the police" to which they responded: "OK, OK, yeah we did hear it on your voice messages, I won't run it."
The allegation will most likely shift the focus onto Piers Morgan, the newspaper's former editor. Blogger Guido Fawkes picked up on quotes from Morgan where he apparently admitted to listening to an answer phone message Sir Paul had left for Mills at the time they were together.
In 2006 Morgan wrote in the Daily Mail: “Stories soon emerged that the marriage was in trouble – at one stage I was played a tape of a message Paul had left for Heather on her mobile phone. It was heart breaking. The couple had clearly had a tiff, Heather had fled to India, and Paul was pleading with her to come back.”
Piers Morgan issued a statement via CNN on Wednesday saying he has never knowingly publishing stories based on 'hacked' phone messages.
"Heather Mills has made unsubstantiated claims about a conversation she may or may not have had with a senior executive from a Trinity Mirror newspaper in 2001.
"The BBC has confirmed to me that this executive was not employed by the Daily Mirror. I have no knowledge of any conversation any executive from other newspapers at Trinity Mirror may or may not have had with Heather Mills. And to reiterate, I have never hacked a phone, told anyone to hack a phone, nor to my knowledge published any story obtained from the hacking of a phone."
The Mirror Group Newspapers have released a statement saying they abide by the PCC code.