Los Angeles: Pop star Miley Cyrus has reportedly refused to perform on The Voice because of her dislike for Christina Aguilera, who judges the talent show.<br>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.<br>‘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 <br>aside, The Voice is still Christina's show and Miley doesn't want to lift a finger to help that woman,’ the source added.ians