Coleen Nolan claimed that Sir Jimmy Savile suggested she join him at a hotel following a TV recording when she was just 14.
She had been in the Top Of The Pops studio, along with her chart star sisters who were appearing on the show.
Speaking on ITV1's Alan Titchmarsh Show, she said: "At the time I was 14 and it was just an uncomfortable situation.
"The girls were doing Top Of The Pops and I stood with him while he made the announcement and it was an uncomfortable situation, the way he held me and then he mentioned about going to a hotel. But you didn't talk about those things then."
Jimmy Savile was questioned as a suspect by police investigating the Yorkshire Ripper, according to a retired police officer.
Jimmy Savile's nephew has spoken of the emotional turmoil his family is going through in the wake of the sex abuse allegations.
A colleague of Jimmy Savile allegedly raped a woman on BBC premises in 1970, ITV News has been told.