"Very excited to go to my first wardrobe fitting of OITNB!" wrote the 61-year-old actress. "Will I be in orange or black?:)."
News of Steenburgen's casting comes seven days after the entire second season of the show was unveiled on Netflix. The season has received mostly positive reviews including a score of 90 on aggregating reviews site Metacritic .
The Jenji Kohan comedy-drama series follows the 15-month prison sentence of Piper Chapman (Taylor Schilling), an upper-middle class woman living in New York who is sent to federal prison for her involvement in a drug operation ten years prior.
According to the Hollywood Reporter, the details behind Steenburgen's character have yet to be revealed.