Who's the biggest diva of them all?
What better person to find out all the gossip from those who have worked with them exceptionally close?
These former personal assistants have spilled on beans on their most shocking stories about their A-list bosses.
Here are some of the celebrities who are a nightmare to work with.
"A Star Is Born" actress and singer Lady Gaga reportedly doesn't want to be left alone, so she required her assistant to be with her 24/7 that she had no time to "talk to family, talk to friends and no chance to have sex."
One weird thing was even required to sleep in the same bed as the pop star and showered with her.
The singer was sued for unpaid overtime for nearly $400,000.
Since her childhood, a rich and pampered girl, it's not surprising that Kylie Jenner expects people to do things for her.
Former staff of the highest-paid celebrity has revealed that this goes to somewhat ridiculous extents.
According to them, the "Keeping Up With the Kardashians" star barely does anything herself. Kylie even uses her housekeeper's arm for arm swatches when she has new products to launch for Kylie Cosmetics.
Too bad for former assistant Harrison Cheung, who used to work for "Batman" star Christian Bale.
He claimed that the actor would ask his assistant to do just about anything, from sniffing Christian's armpit for body odor before walking the red carpet.
Other times, Harrison is forced to go on "sock runs" if the actor was all out of clean ones.
A tipster once told NY Daily News that Ariana Grande's latest rule included carrying her around like a baby.
When she doesn't feel like walking, the "Thank U, Next" star would ask her assistant to pick her up.
Many of her former housekeepers revealed that they have seen Angelina Jolie throwing a few tantrums, whether she is with her kids or having disagreements with her then-husband, Brad Pitt.
Khloe Kardashian doesn't like lifting a finger at her house, according to Radar Online, as she barks orders at her assistant and housekeepers for whatever she may like.
Once, Justin Bieber was caught carrying an illegal substance to the airport.
Unfortunately, his assistant at that time, Terrance Reche Smalls, suffered the effects and took the fall for the singer.
He pleaded guilty to two charges of marijuana and was handed a 12-month good behavior bond.
Terrance was also forced to pay a fine of $1,000, but surely Bieber had to pay that and additional fees for tarnishing his assistant's name in the law.
In a filed lawsuit in 2004, Mariah Carey's personal assistant claimed that she made him work 16-hour days with no overtime pay or meal breaks.
The diva doesn't even wash her own hair, as per the former PA, as she hires a professional do it or her own assistant.
Because she's such a germophobe, Madonna's staff walked out after one work of working at her home because she made all her team work 24/7 and made them all go on a macrobiotic diet.
A former staff of the "Be Kind" host revealed she was the subject of racist micro-aggressions and abuse.
News of Ellen DeGeneres' mean-spiritedness is consistent, as many ex-employees come forward with stories about her.