The Oscar-winning actress says that she made the unsanitary decision in order to play a crack addict convincingly.
Halle took on the role when she starred alongside Wesley Snipes and Samuel L Jackson in Spike Lee's 1991 movie 'Jungle Fever'.
She explained: 'That was my first acting job, so that was the only way I knew how to do it, was to try and be it. And I went to a real crack den with an undercover police officer.
'But I had no idea what this world of crack cocaine was, what this life was, so I had to go in and see it because I don't think at that time it was anything you could read about.
'So yeah, I didn't bathe for really about a month.'
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