Pop star Miley Cyrus has reportedly refused to perform on `The Voice` because of her dislike for Christina Aguilera, who judges the talent show.

Although the 33-year-old Aguilera is currently on a two-season break from `The Voice`, Cyrus has refused to appear on the programme over its affiliation with the former, reports contactmusic.com.

"Miley is no friend or supporter of Christina, despite the fact they have a lot in common, including long associations with Disney and using some of same people through the years on their respective business teams,` a source told RadarOnline.com.

"Even if Christina has temporarily stepped aside, 'The Voice' is still Christina's show and Miley doesn't want to lift a finger to help that woman,` the source added.