A man has been arrested on suspicion of harassing Tulisa Contostavlos after allegedly turning up at the British pop star's home in the middle of the night. Police officers were called to the former N-Dubz star's property in Hertfordshire, England on Wednesday (12Jun13) after a man allegedly sneaked past security guards and began banging on the singer's front door, demanding to see her. The terrified star, who was at home at the time of the incident, allegedly sent her personal assistant to confront the man, who fled the property after cops were called, but police officers managed to track him down and arrest him. A spokesperson for Hertfordshire police confirmed to Britain's Daily Mirror that a 24-year-old man from north London had been arrested over the incident and added, "The man was served a first warning for harassment. He was released with no further action and all parties involved are satisfied with this." The incident is the latest bad news to hit the singer, who was arrested earlier this month (04Jun13) on suspicion of supplying drugs.