Demi Moore and Kevin Spacey led an all-star cast promoting their new movie Margin Call at the Sundance Film Festival.

The 49-year-old Mrs. Kutcher sang the praises of independent film in her first outing at Sundance, a festival celebrating films made outside the studio system.

The event was set up by actor and director Robert Redford in 1981 as an antidote to the more glitzy Hollywood awards ceremonies.

Jeremy Irons and Paul Bettany add British talent to the cast of Margin Call, a thriller set at an investment bank during the early stages of the financial crisis.

Margin Call is set for release in the US this October, but it could be a while before it hits UK screens.