Kylie and Cheryl to appear on The Voice

BBC1's The Voice ratings have been down for the past two weeks. Credit: Press Association

Kylie Minogue and Cheryl Cole are among the stars lined up for guest appearances on BBC1's The Voice as the show battles a ratings slide.

The addition of the two chart stars comes as the programme suffered a further audience blow for its results show on Sunday - losing two million viewers in a week.

On Saturday Britain's Got Talent beat The Voice for the second week in a row.