Hollywood studios are banning A-listers from leaking information via Twitter over fears the film industry is being damaged.

According to the Hollywood Reporter, a recent contract issued by Disney has banned confidentiality breaches via ‘interactive media such as Facebook, Twitter or any other interactive social networking site, blog or other internet-type site.’

Apparently, rival studio DreamWorks has issued similar guidelines, meaning Cameron Diaz and Mike Myers, who are due to make a Shrek film next year, could be two of the stars affected.

An entertainment lawyer told the Hollywood Reporter: ‘Hollywood has a long history of controlling what talent says in the media. This is just a new area of media that hasn’t been controlled yet.’

Last month American Idol judge Paula Abdul dramatically announced that she had quit her role on Twitter. Fox News later issued an official reaction but the news had already spread worldwide.