[MarkWaldorf]

Superstar Mariah Carey last night joined the stellar line-up for The Sun's Haiti charity single as its earthquake disaster appeal topped the £1million mark.

Grammy award-winning singer Mariah, 39, agreed to take part in the cover version of REM's ballad "Everybody Hurts" in a project being masterminded by X Factor chief Simon Cowell.

Disney star Miley Cyrus, 17, also signed up over the weekend as X Factor stars JLS and show judge Cheryl Cole kicked off recording in London.

Cowell, 50, last night paid tribute to all the artists taking part, saying: "We're getting there. We have had an incredible amount of support. It's amazing these great singers are clearing their schedules to make this happen. I just found out Mariah has changed her schedule to be able to do this too. It says such a lot that everyone is working so hard to help Haiti. This is something that really matters to us all and I'm so grateful for the support we are getting."

A source close to Cowell added: "Mariah was brilliant, she wanted to help in any way she could. Her name gives the single another great boost. Simon is working so hard behind the scenes to get this together. He knows this needs to happen quickly to get the money through to Haiti."

Leona Lewis, 24, added her vocals in Los Angeles last night as Cowell faced a race against time to get the single out. Take That and Rod Stewart, 65, are also due in the LA studio today, Alexandra Burke, 21, is set to record in London and Susan Boyle, 48, will add her contribution in Scotland. James Morrison, 25, Mika, 26, and James Blunt, 36, are also among the stars taking part, while others are still trying to make arrangements.

Top producer Steve Robson is putting the track together using new technology that means the artists do not have to be in the studio together.

- The Sun

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