The singer, known for her diva demands, says she can't wear flat shoes but can do anything in heels.

She says : "I guess I'm a heel girl. I can run in them. I could swim in them if necessary.

"I can't wear flat shoes - they give me blisters. My babysitter used to laugh at me because when I was 12 .I would always tiptoe. I couldn't walk flat."

Mariah, 37, also revealed she hopes scientists will have invented a cream to cure old age by the time she needs plastic surgery.

She added: "I hope when I get to the stage when I might need to contemplate cosmetic surgery there will be a cream.