Steenburgen shared the news via Twitter on Friday:
Very excited to go to my first wardrobe fitting of OITNB! Will I be in orange or black?:)— Mary Steenburgen (@MarySteenburgen) June 12, 2014
No details have been released about Steenburgen's role. Season 2 of the Netflix hit was released last week and Season 3 is currently in production.
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Steenburgen, who won an Oscar for Melvin and Howard, most recently appeared on Justified, Wilfred, 30 Rock and Bored to Death, opposite her husband Ted Danson.
Get more scoop on the series and why it's our pick for Binge Saturday: