The most outrageous celebrity diva demands According to her rider, she's not a fan of "busy patterns" and "doesn't do stairs," but Mariah Carey took diva refusals to the next level when, according to presenter Kate Garraway, she declined to sit down on the GMTV sofa without assistance. Garraway said that the world's best-selling female artist claimed that she wanted to keep creases out of her dress, and insisted that two ITV producers were on hand to help lower her onto the sofa when she appeared on the breakfast TV show back in 2009. She also had an assistant walk backwards in front of her at all times in case she fell over. Christina Aguilera Everyone knows the importance of temperature when it comes to the enjoyment of a beverage and Christina Aguilera is no exception, according to The Daily Mail. While bottles of water (although not Evian) must be kept at room temperature, hot drinks such as tea and coffee must never fall below 175 degrees farenheit. Food shape is also important to the singer, who demanded her vitamin C tablets be shaped like characters from the TV show The Flintstones. Beyoncé Beyoncé Knowles performing at the 2013 Superbowl (REX) What can you expect in your rider when you're the daughter of pop royalty? No less than a luxury nursery, of course - at least if The Daily Star's report is correct. When performing at the Super Bowl last year the newspaper reported that Beyoncé Knowles was firm in her requests to keep daughter Blue Ivy comfortable, asking that her nursery was scented with rose-petal candles and kept at a cosy temperature of exactly 26 degrees. It also reported that her £14,000 handmade cedar cot had to be flown over from New York to ensure optimum sleeping conditions. Jennifer Lopez Jennifer Lopez performing at the 2014 Hollywood Bowl (REX) According to Business Insider, Jennifer Lopez has reportedly insured her bottom for a massive $27million, so it's no wonder she refuses to sit on any toilet seat other than the germ-resistant one that was custom-made for her. The singer, who has sold over 55 million records, is well-known for her diva demands and preference for the colour white - on the video shoot for a charity single she demanded white curtains, furniture, flowers, candles and linen sheets. Kanye West Kanye West performing at Aahh! Don't you just hate it when your carpet isn't perfectly smooth? Kanye West feels your pain. When appearing on the BBC's Later with Jools Holland show last year, Mr Kim Kardashian proved men can be divas too when he demanded that his dressing room carpet was ironed by an assistant as it was "too bumpy," according to The Daily Mail.