The charges, and a series of scandals involving Kelly and underaged girls, seem to have had little impact on the popularity of the Chicago-based singer, songwriter and producer. If convicted he faces up to 15 years in jail. Kelly has pleaded not guilty to allegedly filming himself between January 1, and November 1, having sex with a girl in her early teens. As opening arguments in Kelly's trial finally got underway Tuesday six years after the Grammy-award winning artist was charged, jurors sat motionless and expressionless with the lights dimmed to watch the minute video. The couple also engage in various sex acts. Once he viewed it, he knew the female was a minor because he questioned her about two years prior for another investigation. But the defense lawyers said the man in the video does not have such a mark. Also at issue is a birthmark or "significant" mole - about three centimetres in diameter - on the lower part of Kelly's back. One of his defense attorneys, Sam Adam, said Kelly was not the man in the tape, adding the entire prosecution case was "suspect. Kelly, who grew up in a public housing estate on the South Side of Chicago and scored a massive hit with his tune I Believe I Can Fly, had three top 10 hit singles last year. He has sold more than 12 million records since his arrest in June , pumping out an album a year and collaborating with everyone from Celine Dion to Kid Rock. Lead prosecutor Shauna Boliker alleged that Kelly was a "pornographer" and said he was the man in the video, having sex with a child. Retired Chicago police detective Dan Everett told the court that he and his partner were sent to the Chicago Sun-Times in February to get a VHS videotape from a reporter who had been sent it anonymously.