has slammed Miley Cyrus
, branding her controversial performance at the Cher
also had a few words to say about Cyrus' steamy VMAs
stint, telling USA Today
that it "was so bad".
The 67-year old singer - who has just signed up to be a mentor
on The Voice USA
- said: "I'm not old-fashioned. She could have come out naked, and if she'd just rocked the house, I would have said, 'You go, girl'.
"It just wasn't done well. She can't dance, her body looked like hell, the song wasn't great, one cheek was hanging out. And, chick, don't stick out your tongue if it's coated."