LONDON (DM): Former X Factor judge Tulisa Contostavlos was arrested on Tuesday on suspicion of supplying class A drugs, sources said. The 24-year-old singer, who found fame with N-Dubz, was arrested along with a 35-year-old man by appointment at a central London police station and they both remain in custody. The arrests come after the Metropolitan Police said its officers were ‘considering’ information after a newspaper suggested Contostavlos had acted as a go-between in a drug deal by introducing a journalist to an alleged supplier.