Singer Paolo Nutini was seen behind the wheel of a car shortly after ordering a vodka, a court has been told.

A witness said he saw the singer and a friend ordering the drinks in DeBeers bar in his hometown of Paisley, Renfrewshire, before allegedly spotting him driving a Mini on February 21 this year.

The 30-year-old pop star is on trial at Paisley Sheriff Court accused of driving on various streets in the Renfrewshire town while more than twice the legal limit.

He denies the charge. His defence agent Massimo Franchi said his defence was "post-incident drinking".

The witness told the court that he saw Nutini in the pub, sitting at a table behind him with another man and a woman.

During the hour and a half he spent in the bar, he said that he noticed Nutini buy one round at the bar and the other man buy two rounds.

When asked by prosecutor Frank Clarke if he was able to hear what was ordered, the man replied: "From memory, I believe it was vodka, more than one, but I could not be certain of that."

The witness said Nutini left the bar about ten minutes before him and said he next saw the singer about 15 minutes later in the driver seat of a black Mini at traffic lights on Maxwellton Street and Canal Street, with a woman in the car.

When the prosecutor asked: "On seeing this Mini driver and recognising Mr Nutini, what were your thoughts?" He answered: "I had seen him drinking at the bar having more than what would be the legal limit of one to two drinks."

During cross-examination, defence agent Mr Franchi asked: "He [Nutini] goes back to his table and you don't know what happens, those drinks could have been spilled, you don't know." The witness agreed.

The defence agent also asked whether Nutini could have been ordering a soft drink, saying: "You cannot tell the court if he ordered vodka or soda and lime." The witness replied: "I believe I heard vodka being ordered but not anything else."