Leona Lewis was signing copies of her autobiography
A man accused of assaulting pop star Leona Lewis is not fit to attend court, a judge has been told.
Peter Kowalczyk, 29, was charged with striking the singer during a book signing at Waterstone's in Piccadilly, central London, on 14 October.
Mr Kowalczyk, who did not appear on Monday, has been sectioned under the Mental Health Act and is being examined by psychiatrists, the court was told.
The City of Westminster Magistrates' case was adjourned until 23 November.
Mr Kowalczyk's solicitor, Mark Fidler, said the results of psychiatric tests would dictate what approach is taken to the case.
The defendant, of Waterloo, south London, has unconditional bail but is unable to leave hospital under the terms of the Mental Health Act.
Lewis's second album, Echo, is scheduled for release in November. She is due to play a gig in her native Hackney in east London on 2 November.