Mariah Carey confessed recently that she's on a special diet because she want to be prepared for the Saturday's Live 8 event in Hyde Park. Carey enthuses, "This is such a special event for me. I want to sing my best and look my best.

"I've been working on my voice to make sure it's in top condition and working on my body too. I've been dieting and exercising non-stop so I can get into the outfit I want to wear."

Among the celebrities that will perform at the concert will be Sir Paul McCartney, U2, Madonna, Robbie Williams, Sting and REM.