Keira Knightley and Benedict Cumberbatch helped kick off the 58th BFI London Film Festival with the premiere of their new movie "The Imitation Game". The rainy day didn't dampen their spirit. The two were all smiles posing for photographers under an umbrella, AceShowbiz said.

Other celebrity attendees included Andy Serkis and wife, Terry Gilliam, John Hurt, Allen Leech, Charles Dance and Mark Strong. Director Morten Tyldym and producer Harvey Weinstein also attended the special screening at the Odeon Leicester Square on October 8.

Inspired by the real life story of computer scientist Alan Turing, the movie follows the genius as a key codebreaker for the British during the World War II. It will hit limited theaters in the U.S. on November 21.