Singer Leona Lewis was punched by an alleged fan while at a signing for her autobiography, Dreams, at a London bookstore on today (Wednesday, October 14, 2009).

According to sources, Leona Lewis, 24, had been signing autographs for more than an hour at Waterstone’s book store in Piccadilly Circus when an alleged fan walked up with a book which she signed and as she proceeded to glance up at him, she was then punched in her face which caused bruising.

Currently the singer is stated to be in shock over the incident and ran away covering her eye.

The singer did not have to be hospitalized, however due to the incident, Leona Lewis has canceled an appearance on “The One Show” for BBC which was scheduled for tonight.

The incident is currently being investigated and the unnamed suspect who was stated to be laughing during apprehension was arrested.

In other news, Leona Lewis is scheduled to release her second album entitled “Echo” on November 17, 2009.