The undercover reporter known as the "Fake Sheikh" has told the trial of Tulisa Contostavlos that she said she smoked cannabis but was not a cocaine user.
Mazher Mahmood gave evidence from behind a screen to protect his identity.
He told Southwark Crown Court that he met with the former N-Dubz singer at London's Metropolitan Hotel last year as he posed as a film producer.
Mr Mahmood said the former X Factor judge had discussed drug use with him and another undercover reporter. "She brought it up with words to the effect that she would go home tonight and have a drink and she might have cannabis to go to sleep," he told the court.
The reporter said they later discussed drugs at the hotel bar when Contostavlos said she was not a cocaine user but did smoke cannabis.
The trial continues.