London: Celebrity chef Nigella Lawson used drugs for a decade without her then husband Charles Saatchi’s knowledge, her former assistants told court, reports PTI. The allegation came into light during a pre-trial hearing in London where her two former assistants, Francesca and Elisabetta Grillo, were charged with stealing money from Saatchi to spend on luxury items and holidays, reported Sun online. Francesca and Elisabetta told the court that Lawson used cocaine, cannabis and prescription pills daily for a decade. The sisters said that Lawson authorised the use of Charles’ company credit card for their personal use in exchange for their silence on the issue. “In a nutshell, we submit that she had a guilty secret from her husband, her then husband. She did not want him to know of her use of cocaine and that is highly relevant to the defense case,” Elisabetta’s lawyer.