Leona Lewis Picture 5370031

Pic caption: * LEWIS 'SLAPPED' AT BOOK SIGNING. Police in London have arrested a man accused of assaulting LEONA LEWIS during a book signing event on Wednesday (14Oct09).. The Bleeding Love singer was autographing copies of her life story Dreams at a branch of Waterstone's in central London when she was reportedly slapped by an onlooker.. Cops raced to the scene of the alleged attack and an unidentified man is still in custody as WENN goes to press.. Lewis, who shot to fame after winning U.K. TV talent show The X Factor in 2006, was not badly injured and did not require hospital treatment, according to a Scotland Yard spokesman.. Her representative says, Leona was a victim of an unprovoked attack this afternoon at her book singing.. The police were called immediately and medical attention has been sought.. Leona's understandably badly shaken and apologises to the fans she was unable to meet and complete signings for. (ZN&IG/WNWCCB/MT). . Leona Lewis . signs copies of her new book 'Dreams' at Waterstone's Piccadilly. London, England - 14.10.09