Oscar-winning Australian actor Geoffery Rush is denying inappropriate behaviour during the production of King Lear.
The Sydney Theatre Company (STC) says it received a complaint that alleged misconduct went on for several months during the play's run.
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The complaint was made after the play's run was over in January 2016.
A lawyer for the Pirates of the Carribean star told the Daily Telegraph he was not approached about the complaint, and hasn't been told what it involves.
Australian correspondent Jason Morrison told The AM Show it's a "bombshell" he saw coming.
"There has been a rumbling about this for a couple of weeks, that a media outlet had gathered some information about this.
"An accusation that has been made by someone about Geoffery Rush's behaviour ... But that's all the detail I have on it, not because of the lateness of the story but because that's about as far as the story goes.
"He's a huge Australian name, he's an Oscar winner and he was Australian of the Year only a few years ago - controversially, not because of any behavioural questions but simply because people couldn't figure out why we gave Australian of the Year to an actor.
"This is extraordinary."
It's the latest in a run of celebrity outings as more women come forward with sexual harassment allegations against high profiles in the entertainment industry.