At a Christmas party for the Russian nouveau riche at the French Alpine resort of Courchevel in January 2007, he was arrested on suspicion of arranging prostitutes for his guests. After three days, he was released without charge. In September 2009, Prokhorov was officially cleared from this charge and the court case was dismissed. According to the French prosecutor, he had paid all expenses for the single women to travel to France, but they were not professional prostitutes or working for a prostitution agency.