British film Antonement opened the festival. Keira Knightley turned up in a pink gown by Chanel. She was joined outside the Palazzo del Cinema by co-star James McAvoy.
Colin Farrell and Ewan McGregor play Cockney brothers drawn into a life of crime by a beautiful woman. It's Woody Allen's third film set in London after Scoop and Match Point. He says he's planning more in the city.