British singer Leona Lewis was "understandably shaken" after a man attacked her during a book signing in central London Wednesday afternoon, a spokeswoman for her record label said. Leona Lewis was signing copies of her book "Dreams" when a man assaulted her, police say. A 29-year-old man was arrested after he punched Lewis at the Waterstones bookstore in Piccadilly Circus at 4:36 p.m. (10:36 a.m. ET), according to a Scotland Yard statement.