Sienna Miller Appears on 'Fallon' After Making Red Carpet Debut with Boyfriend Oli Green

Sienna Miller discusses 'fangirling' over working with Amelie Bea Smith - the voice of Peppa Pig

Sienna Miller dazzles in a beaded one-shoulder gown at the Vanity Fair Oscars' afterparty

Jessica Chastain, Rita Ora, Heidi Klum, Kim Kardashian and Julia Fox at Vanity Fair's Oscars party