Lady Gaga has been branded a "bully and a monster".
The singer - who has repeatedly spoken out against bullying - has been accused of "unpredictable behaviour" which has seen her lash out at her staff for no reason, leaving others afraid to step in or speak out.
One of Gaga's former crew members who worked for the popstar on her Monster's Ball world tour between 2009 and 2011 described how she "crucified" a back-up dancer in front of others.
"She would have a prayer circle before each show," the worker said. "One night she just suddenly turned on one of the backing singers, branding her unprofessional and ungrateful.
"She crucified her in front of dozens of people - she skinned this girl alive.
"It was so painful to watch - and no, you couldn't step in.
"She offers support to her fans who are victims of bullying and calls them her monsters - but she is a bully and a monster herself."
In May, Kelly Osbourne slammed Gaga as being a "hypocrite" for not intervening when some of her loyal followers - which the stars calls her "little monsters" - inundated the reality TV star with death threats over her comments about one of the singer's outfits on her TV show, Fashion Police.
The heated exchange spurred a war-of-words over social media between Gaga, Kelly and her fiercely protective mother, Sharon Osbourne.