The pair teamed up for Gosling's directorial debut Lost River, with Mendes taking a role in the movie to give her partner some moral support on set.

Now Gosling has told how she also helped him keep within the film's meagre budget by purchasing cheap outfits from second-hand shops.

Gosling tells Britain's The Sunday Times Culture magazine, "She was helpful throughout. We didn't have a lot of money for clothes, so she went out to Salvation Army stores and found that gold jacket Matt (Smith) wears."

Lost River is due for release in the U.S. and U.K. later this month (Apr15).