Leona Lewis slapped at book signing

X Factor winner Leona Lewis has apparently been slapped at a Waterstones book signing in London.

The singer was at the store signing copies of her new autobiography Dreams. Scotland Yard confirmed that officers were called to the store in Piccadilly this afternoon, reports the BBC.

"The female did not require hospital treatment - we are at the scene," stated a police spokesperson. Waterstones staff refused to comment on the incident, but said that the store remained open.

Lewis, who won the ITV1 show in 2006, releases her second album Echo on November 16. It is preceded by her new single 'Happy' on November 9.

Yesterday, the 'Bleeding Love' star announced a homecoming gig at the Hackney Empire, which will take place on November 2.