LONDON (CNN) -- Charles Saatchi, the millionaire ex-husband of celebrity chef Nigella Lawson, is due to testify Friday at the trial of two former personal assistants accused of defrauding the couple.
The former assistants, Italian sisters Francesca and Elisabetta Grillo, deny embezzling hundreds of thousands of pounds on company credit cards.
Saatchi had been expected to testify Thursday, but there was not time for him to take the stand after the first witness in the case. He arrived at the court Friday morning.
That witness, Rahul Gajjar, an accountant for Saatchi, told the court in west London on Thursday that Francesca had 64,336.97 pounds ($104,500) in expenses on her company credit card in June 2012.
Among the expenses were purchases from designer labels Prada, Miu Miu, Louis Vuitton and Chloe, as well as hotel bills and plane tickets.
The court heard that Francesca's average monthly expenditures were 48,000 pounds and Elisabetta's were 28,000 pounds, whereas other personal assistants to Saatchi, a well-known art collector, spent a maximum of 8,000 pounds a month.
The sisters were expected to make purchases for the family on the company credit card, he said, as part of their job helping the couple with personal and work-related matters.
But the prosecution says they spent large sums on money on themselves.
Drug use claims
Isleworth Crown Court heard at a pretrial hearing for the sisters this week that Lawson and Saatchi had a "culture of secrecy" around their marriage.
In the hearing, the defense read an e-mail from Saatchi to Lawson about the allegedly embezzled money, saying the assistants would "get off" because, he wrote, Lawson was using cocaine and marijuana on a daily basis and "allowed the sisters to spend whatever they liked."
Representatives for Lawson declined to comment on the allegations, citing the ongoing court proceedings.
The defense also read a statement from Saatchi saying he learned of Lawson's alleged drug use in June, around the time the couple were photographed in a restaurant having an argument.
In the photos, which were splashed across the front pages of national newspapers at the time, Saatchi is seen with his hand around Lawson's throat. Saatchi accepted a police caution for assault, and the couple announced they would divorce soon afterward.
The defense alleged that the e-mails showed both Saatchi and Lawson had attempted a "manipulation of the court" and that the case should be thrown out. The judge ruled the trial would proceed.
The prosecution told the court Wednesday that the two sisters spent about 685,000 pounds ($1.1 million) on company credit cards over the course of four years, according to UK media reports.
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