Kym Marsh felt "sick to the stomach" when she heard a sex tape reportedly starring her was being touted to the highest  bidder.

Kym said: "As you can imagine, I felt immediately sick to my stomach and was extremely upset - it's been devastating for me and my family.

"I can't say too much because the police are investigating and I don't want to affect anything that they are doing - it's really important that whoever is behind this is caught."

While it is claimed Kym is the woman in the video, it is not clear who the man is.

The mum-of-three continued to OK! magazine: "It's been one of the worst weeks of my life and I won't rest until the person is caught. Thankfully, all my family and friends have rallied round to support me - I'm very lucky to have them."

When the tape was revealed, Kym - who was a member of British pop group Hear'Say - was said to be paranoid about the video footage and the photographs being made available to the public.

An insider revealed: "She is stunned that someone is willing to betray her. She feels furious, humiliated and very vulnerable.

"She can't believe that someone could sink so low. She can only assume this is an act of pure greed.

"Kym has done nothing wrong. She will do all she can to stop these images being made public."

Kym has been married twice, to actors Jack Ryder and Jamie Lomas, and was engaged to Dan Hooper until last year. She is currently dating personal trainer Matt Baker.