A man has been arrested for assaulting X Factor singer Leona Lewis at a book signing in central London this afternoon. The “Bleeding Love” songbird was slapped by an unidentified man during a signing session for her autobiography, Dreams — to be released next month — on Wednesday.

Well, who knew book signings could be so dangerous, huh?

“We were called to Waterstones Piccadilly Circus at 4:35pm to reports of an assault. It appears that a male has slapped a female at the location,” a spokesman for Scotland Yard told the BBC News this afternoon.

“He walked up there with the book, she signed it and as she looked up he just punched her,” an eyewitness told reporters.

“Suddenly the security all jumped on him and they were trying to pull him out and he was just laughing, he thought it was funny,” a second witness added.

Leona’s spokesman says the singer is “understandably badly shaken” after the attack.

“Leona was a victim of an unprovoked attack this afternoon at her book singing,” the star’s rep said in a statement issued just moments ago. “The police were called immediately and medical attention has been sought. Leona’s understandably badly shaken and apologizes to the fans she was unable to meet and complete signings for.”

Leona’s sophomore album, Echo, is due later this year.