London authorities have arrested a crazed man accused of punching "X-Factor" beauty Leona Lewis at a book signing on Wednesday.

Photogs snapped the songstress hiding tears behind dark sunglasses as she left the signing. "The female did not require hospital treatment," a Scotland Yard spokesman confirms to the BBC. "We are at the scene."

The three-time Grammy nominee was signing copies of her new autobiography, "Dreams," when the alleged attack took place.