Khloe Kardashian and Lamar Odom at launch of their fragrance 'Unbreakable' at Redbury Hotel in Hollywood, California.

Khloe Kardashian and Lamar Odom at launch of their fragrance 'Unbreakable' at Redbury Hotel in Hollywood, California.

The Kardashians are being investigated for allegedly using "slave labour" to manufacture the products that have helped them to earn millions.

The Institute for Global Labour and Human Rights has told Star magazine that Chinese sweatshops where "workers are abused and virtually imprisoned" make some of the goods that the reality stars endorse and sell through the K-Dash fashion label and Kim Kardashian's ShoeDazzle company.

The group's executive director, Charles Kernaghan, told the US magazine: "The Kardashians are in bed with some pretty bad people.

"They are holding hands with a government that spits on democracy and women's rights."

The allegations about the factory conditions in China's Guangdong region are alarming.

According to the report, workers, some as young as 16, live in "squalid" dormitories that smell of sewage and work up to 84 hours a week for next to nothing.

The Kardashians have so far denied any knowledge of the alleged abuses.

A representative for the Kardashian clan told US website Gossip Cop that this is the "first we are hearing of this and take this very seriously [sic]. We are investigating the matter as [the Kardashians] do not condone this".