[custom_adv] KATY PERRY If being a diva is wrong, Katy Perry doesn't want to be right. In 2015 she said, "People like to do this like, exposé, like, 'Katy Perry's tour life. [custom_adv] PRINCE In case you needed any more reason to mourn the Purple One, here's badass Prince factoid #438 trillion. [custom_adv] RIHANNA "You never know what mood you're gonna be in," Rihanna explained to Ellen earlier this year. [custom_adv] JUSTIN BIEBER In 2013, the Biebs' (pretty tame) rider requests included three packs of socks and four packages of plain white T-shirts, all in varying sizes, because...your guess is as good as ours [custom_adv] MADONNA What's the point of being Madonna if you can't get a little suuuuuper demanding?? For her 2012 MDNA Tour, The Queen of Pop required that "all furniture be removed from the rooms and replaced with her own pieces that she has shipped in [custom_adv] BEYONCÉ Despite being, you know, Queen Bey and everything, Beyoncé is consistently cited as one of the easiest artists to work with. [custom_adv] BRITNEY SPEARS For her 2011 show at London's 02 Arena, Britney asked that a framed photo of Princess Diana be put backstage, along with fish and chips. [custom_adv] MARIAH CAREY For an appearance at a London mall just before Christmas, Carey asked to be surrounded by "20 white kittens and 100 white doves," because life is for dreaming. Unfortunately, the request was denied in the most British of ways. [custom_adv] KANYE WEST When it comes to skin care (and music and money and Kim Kardashian and just about anything else), Yeezy doesn't mess around. [custom_adv] COLDPLAY In perhaps the least rock 'n' roll (but, okay, most adorable) request of all time, the members of Coldplay ask for postcards from each city they tour in to collect as souvenirs for their children.