Reports claim she risks arrest after wild night.

AMY WINEHOUSE may be in trouble with the law after allegedly headbutting a man outside a London club and punching another in the face, according to reports.

British tabloid The Sun says the troubled singer not only attacked the two men, but kissed another, busted up the bar and smoked drugs on the sidewalk. The article includes a slideshow series of photos from that evening, including one in which she walks into a lamppost.

Meanwhile, Metropolitan Police tell People.com that they "are investigating an alleged assault on Chalk Farm Road at approximately 3:20 am on April 23. A 38-year-old man [contacted] Kentish Town police station and alleged a 24-year-old woman had assaulted him. No arrests have been made as yet but inquiries continue."