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.
More top news
A dead whale - believed to be a minke whale - has washed up on a Devon beach between Dawlish and Dawlish Warren.
The trade secretary has said the UK "has a golden opportunity to forge a new role for ourselves in world" outside of the EU.
The youngster - said to be the sole survivor of an airstrike in Aleppo - spent four hours trapped under rubble before she was rescued.