Mariah Carey

The 'Hero' hitmaker has renowned for her outrageous backstage demands - which in the past have included 20 white kittens, butterfly-shaped confetti,  baskets of puppies, white roses and a "tea service for eight" - but insiders claim there is nothing unusual about the dressing room set-up she has requested in her new job as a judge on the talent show.

A source told the New York Post newspaper: "It's all standard stuff, nothing out of the ordinary. It's not like they'll need to put a new roof on the building. It's standard lists, whether it's for water, soda, veggies, snacks. It's all fairly normal."

In 2010, leaked details of Mariah's tour rider specified that her dressing room have "no busy patterns" although "black, dark grey, cream and dark pink" are all fine, and she should also be provided with a "lamp or clip light," so harsh lighting can be turned off.

The 42-year-old star is also very particular about the temperature of the room, 75 degrees Fahrenheit, while she likes to be surrounded by two dozen white roses and vanilla aromatherapy candles in order to unwind after a show.