Katy Perry is offering her Twitter followers the chance to catch a sneak peek of her new 3D concert movie Part Of Me - three days before the film hits cinemas.
Paramount bosses are planning to screen the movie in 100 cinemas across the U.S. on 2 July.
Movie executives and Twitter.com bosses have joined forces to create a special hashtag that will direct fans to a site where they can buy tickets for the advance showings.
Perry has 22 million Twitter followers.