Steenburgen shared the news on Twitter that she will be appearing in season three of the Netflix original comedy-drama.
Very excited to go to my first wardrobe fitting of OITNB! Will I be in orange or black?:)
ā Mary Steenburgen (@MarySteenburgen) June 12, 2014
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The 61-year-old actress provided no details about the role she will be playing, just teasing: "Will I be in orange or black?"
Steenburgen has previously appeared in television shows including 30 Rock, Justified and Wilfred.
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Current cast member Dascha Polanco has been upgraded to a series regular for season three, alongside Samira Wiley.
Watch stars Taylor Schilling and Danielle Brooks discuss season two of the show below:
