BELIEVE it or not, international megastar Scarlett Johansson went almost unrecognised while filming incognito for London director Jonathan Glazer’s latest film Under The Skin.

The Sexy Beast director used hidden cameras to film Ms Johansson – who was almost unrecognisable in a raven dark wig – as she drives around Scotland playing an alien seductress meeting her ‘prey’ and asking for directions.

Many of the scenes involve ‘real’ people filmed without their knowledge although, of course, Glazer and his crew had then to seek their permission to use the footage in the film.

Glazer said: “The central idea was about disguising the actress and dropping her in the real world.

“Everything had to serve that. So we built a bespoke camera system with heads that were small enough to be hidden, and positioned them according to the action we wanted to cover.”

Mostly, the A-list beauty wasn’t recognised by the men she stopped to try and seduce.

“And that was partly because she didn’t look familiar in the way people are used to seeing her.

“There’s a scene for instance where she falls in the street and is then helped to her feet by passers-by. No-one batted an eye.”

The film, inspired by Michael Faber’s novel of the same name, is about a nameless alien who drifts across Scotland in a van picking up and seducing men before luring them to their death.

It took the director 10 years and three scripts to make and, at its first public screening at the Venice Film Festival he was hoping for a powerful reaction.

And he got one. As part of the audience started to boo, a larger section cheered and applauded.

Glazer’s films often provoke extreme responses amongst audiences and he wouldn’t have it any other way.

“Venice was great for the film, and the sounds of simultaneous clapping and booing was something I’ll never forget,” he said.

Under The Skin (15) is out March 14.