The development strengthens theories the robbery was an inside job and that the gang knew exactly where their target would be at any time.
The 27-year-old driver worked for an upmarket firm that was used by the Kardashian family whenever they were in Paris. Police confirmed reports he would have known all her movements.
Barrister Jean Veil said his 36-year-old client had been left deeply traumatised after being bound, gagged and threatened with death in the French capital last October.
The robbers made off with her 20-carat Lorraine Schwartz engagement ring worth £3.5million and a case of jewellery with a value of £5.24million.