Oscars: Pitt, Clooney and Dujardin on the red carpet

[video]Los Angeles : Hollywood's biggest night got under way on Sunday with the start of the 84th Academy Awards ceremony, as two odes to film-making - "The Artist" and "Hugo" - go head-to-head for Oscars glory. Watch Brad Pitt, George Clooney and Jean Dujardin arrive on the red carpet.