Colin Firth reigns in King's Speech

Colin Firth and Helena Bonham Carter turn on their royal charm at the US premiere of King's Speech.

The British duo star as King George VI and the Queen of England in the story of a King who overcomes a speech impediment.

Colin Firth, who was accompanied by wife Livia Giuggioli, said speaking with a speech impediment was sometimes tough but that the grade of actors made the performance easy.

"It is challenging, but also I think that when something is well-written and you're working with actors of the level of Geoffrey and Helena and Guy Pearce and all the rest, an awful lot of it is taken care of," he said.

King's Speech is currently leading the British Independent Film Awards this year with eight nominations and will be released in UK cinemas on 7 January 2011.