London: Actress Sienna Miller has pulled out of Kevin Spacey`s annual theatre extravaganza as she is too busy filming a movie.
The `Factory Girl` star was due to participate in Spacey`s 24 Hour Plays Celebrity Gala at the Old Vic theatre in London on Sunday but she has axed her appearance to film a movie, reported a wesbite.
"Very sadly, she had to pull out due to a clash of dates and she`s extremely disappointed not to be able to be involved," said her spokesperson.
Miller is believed to be in Los Angeles shooting the upcoming drama `Yellow`, in which she plays a drug addict.
Spacey`s event will feature performers writing, directing and staging short plays in the space of one day.