Lewis was reportedly punched in the head by a man who had queued patiently to meet her at the store, where she was signing copies of her new autobiography ‘Dreams’.
Fan-recorded footage of the incident has since emerged and can be seen by scrolling down now.
Police have confirmed that a man has been arrested in connection to the seemingly unprovoked attack, reports BBC News.
One fan who saw the incident said that Lewis‘ attacker was laughing as he was reprimanded.
“She was running out with her hand over her eye and I just saw a man on the floor,” the fan explained. “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.”
Others told of how shocked they were to see the altercation between Lewis and the man first-hand.
“My brother saw the whole incident,” explained another. “He [the attacker] walked up there with the book, she signed it and, as she looked up, he just punched her. He [my brother] actually heard the impact.”
A spokesperson for the singer said she had been left “shaken” by the incident. “The police were called immediately and medical attention has been sought. Leona‘s understandably badly shaken and apologises to the fans she was unable to meet and complete signings for.”
In the footage below, Lewis is seen holding her head as she’s taken away by minders, while her attacker is pinned to the floor.