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According to Deadline, the actress has already shot three episodes for the new run.
The show stars Kudrow as psychologist Fiona Wallice, who gives her patients advice over a webcam.
Details of Streep's role have not yet been released but rumours have suggested that she plays a counsellor in the show.
Earlier this year, Showtime picked up the produced episodes of the programme and announced that it is planning to convert them into a half-hour series.
