Clock-watcher Helena Bonham Carter

Helena Bonham Carter was always clock-watching on the set of 'The King's Speech'.

The actress - who has been nominated for a Best Supporting Actress Oscar for her role as the Queen Mother in the movie - was making her co-stars laugh during the shoot because she was constantly looking at her watch as she wanted filming to be over.

Colin Firth - who plays Helena's on-screen husband, stammering British monarch King George VI - said: "It's a tribute to Helena's brilliance that she came across as a supportive wife - most of the time when I was doing an agonised stammering scene and was off camera, she'd be looking at her watch."

Helena, 44, previously revealed she was pushed into the role by the film's director Tom Hooper and can never remember saying yes as she was so busy working on other film projects, including 'Harry Potter'.

She said: "To be honest, I never actually said yes to this part.

"Tom Hooper is such a phenomenon of relentless passion and determination he just wasn't going to take no for an answer."