(FROM PEOPLE) – Troubled British singer Amy Winehouse has been arrested for allegedly headbutting a man outside a London pub early-morning on April 23. The U.K. newspaper The Sun reports that Winehouse also punched another man and openly smoked drugs on the street. Photos of Winehouse looking rather haggardly on the night in question have been circulating the Internet this week, including one of her walking into a lamppost. Winehouse checked into rehab last January following the circulation of a viral video that showed the 24-year-old singer smoking from what appeared to be a glass crack pipe. She went on to win five Grammys the next month. (People)