The incident is said to have happened in Camden on Saturday (July 5th), just a day after Winehouse performed to festival crowds in Spain.

Wayne Lindsay claims he didn't say or do anything to provoke the alleged attack, which he said “really stung.”

Lindsay is quoted as telling the Sun newspaper that Winehouse “looked as if she was in another world” while at the venue.

At the end of last month Winehouse lashed out publicly during her appearance at the Glastonbury Festival.

Organisers claim that the singer reacted after she was touched by a member of the audience as she went to greet the crowds during a rendition of 'Rehab'.

As previously reported, Winehouse's appearance last Friday (July 4th) at Rock in Rio in Madrid was praised as “intense” by crowds.

(by Jason Gregory)