US reports state that Shahista Lalani worked for the company as a design intern at  The Row, Mary-Kate and Ashley’s fashion label.

She has filed suit in Manhattan Supreme Court, claiming the company is responsible for “wage theft”.

Speaking to Page Six, Lalani said that a period of  five months she spent working at The Row in 2012 saw her “doing the work of three interns” and being on call “all day, all night”.

Representatives of Dualstar have since denied the claims. In a statement provided to E! News, the company said: “As an initial matter, Dualstar is an organization that is committed to treating all individuals fairly and in accordance with all applicable laws.”

“The allegations in the complaint filed against Dualstar are groundless, and Dualstar will vigorously defend itself against plaintiff’s claims in court, not before the media.

“Dualstar is confident that once the true facts of this case are revealed, the lawsuit will be dismissed in its entirety.”