The class-action lawsuit, filed at Manhattan Supreme Court in New York City, accuses the Olsen sisters of failing to properly compensate around 40 interns who were allegedly asked to work 50-hour weeks with barely any breaks.

In the paperwork, lead plaintiff Shahista Lalani, 29, alleges she was doing the same work as employees at the Olsens' fashion brand The Row, but without any pay, stating, "I was doing the work of three interns. I was talking to (my supervisor) all day, all night. Emails at nighttime for the next day, like 10 pm at night... (I was) inputting data into spreadsheets, making tech sheets, running personal errands for paid employees, organising materials, photocopying, sewing, pattern cutting, among other related duties... When we weren't doing something, they'd be like, 'Organise the buttons in the back by color code.' You're cleaning. You don't get a set 15-minute break. You just go with their crazy flow. You just (got) caught up in the pressure... You're like an employee, except you're not getting paid."

However, she adds of the Olsen sisters, "They're really nice people. They were never mean to anyone. They're business people."

The lawsuit states the interns should have been paid minimum wage plus overtime.

Annett Wolf, a spokeswoman for the Olsens' Dualstar Entertainment Group company, tells the New York Post, "Dualstar is not aware of this."