R&B singer Amy Winehouse has been arrested for an alleged assault. According to People, The Troubled star allegedly headbutted a man outside a London pub. She voluntarily reported to a London police station on Friday to answer questions, and was arrested. “I can confirm that a 24-year-old woman has been arrested by appointment at a central London police station and is currently in custody,” a spokesman for Scotland Yard tells People. It is a policy in England to arrest a suspect before questioning her in connection to a possible crime. Winehouse has not been charged with anything. A 38-year-old man filed a report stating he was “headbutted” by Winehouse after trying to hail her a cab at 3:20 a.m. on April 23. According to a detailed account in the British paper The Sun, she also allegedly punched another man in the face and smoked drugs on the street. The article was accompanied by a sequence of photos, including one of Winehouse walking into a lamppost.