The American invasion was led by Anne Hathaway who wowed the crowds in a Burberry LBD.
The 'Les Miserables' star, who was nominated for Best Supporting Actress, went for a fashion-forward look in a t-shirt style dress with a small clutch and matching bangles.
Jennifer Lawrence, fresh from her dress mishap at the SAG Awards last month, was forced to cover her strapless white gown with a blazer as the British elements did their best to dampen the occasion.
Jennifer Lawrence covers up
But she later showed it off in it's full glory, topping off her look with slicked back hair.
She jetted in from the US to find out if she had bagged the award for Best Leading Actress for her role in 'Silver Linings Playbook'.
Also direct from Hollywood was Jessica Chastain, who sashayed her way down the red carpet in a dazzling blue number.
The 'Zero Dark Thirty' star wore her hair in waves and kept her make-up simple.
Take a look at what everyone else was wearing on the red carpet below...