Five members of Madonna’s staff have hit the Material Girl with letters of resignation amid claims that the singing star demands too much of her employees.

Personal assistants Johanna Edholm, Denise Lamberston, nannies Elodie and Angela Jacobson, and driver Alistair Mitchell have handed parted company with The Material Mom, citing long working hours as their primary reason for their departure, Britain’s PEOPLE reports.

The walkout comes as a huge blow to Madonna, who arrives in the Central African nation of Malawi today to adopt a new child.

“Madonna’s relied on the nannies to care for her kids whenever she is working. All Madonna’s employees work incredibly long hours,” says one source.

“Bank holidays are normal working days and there’s no special allowance for Christmas,” another insider added. “Her attitude is she is a superstar and is expected to work, so why shouldn’t her staff?”

“They don’t really have a life of their own.”