One of the personal assistants accused of defrauding Nigella Lawson and Charles Saatchi has accused them of lying under oath as she gave evidence in her trial.
Elisabetta Grillo, 41, also said other members of the TV cook's "Team Cupcake" lied in court.
The defendant, who along with her sister Francesca Grillo, 35, is accused of spending £685,000 on credit cards belonging to the celebrity couple to buy designer goods and luxury holidays for herself, made the claims as she spent a second day in the witness box at Isleworth Crown Court in west London.
As she began cross-examining her, prosecutor Jane Carpenter asked: "Ms Grillo, is it your evidence that Ms Lawson has lied to the court?"
She replied: "Yes."
"And Mr Saatchi?"
"And you're the one telling the truth?"
"And the other PAs, have they lied as well?"
The court previously heard that the defendants allege that Ms Lawson, who divorced multi- millionaire Mr Saatchi earlier this year, regularly snorted cocaine and smoked cannabis during her 10-year marriage.
But, giving evidence last week, Ms Lawson told jurors she had only taken cocaine with her late husband John Diamond when he found out he had terminal cancer, and on another occasion in July 2010 during her troubled marriage to Mr Saatchi.
Giving evidence yesterday, Elisabetta said she regularly found signs that Ms Lawson was using cocaine, including a packet of white powder found in a toilet in the home she shared with Mr Diamond, as well as rolled-up banknotes and credit cards with white powder on them.
Asked if she had ever seen Ms Lawson taking drugs, Elisabetta - who is also known as Lisa - said: "No."
But she told jurors she was aware that Ms Lawson had taken illegal substances.