Orange Is The New Black Season 3 is signing up some new cast members. 'Justified' star Mary Steenburgen signed up for a mysterious new role on Orange Is The New Black Season 3 according to the Hollywood Reporter. The actress broke the news last Thursday via her Twitter with a tweet: "Very excited to go to my first wardrobe fitting of OITNB! Will I be in orange or black?:)"

Production for the third season of the hit Netflix series is already underway for the women's prison series from creator Jenji Kohan, starring Taylor Schilling and Laura Prepon, according to the Hollywood Reporter.

TVLine reports that while previously Steenburgen's role had been kept under wraps, the 'Back to the Future' franchise star will play mother to Pablo Schreiber's character, George "Pornstache" Mendez.

'That 70s Show' star Laura Prepon will be back in full force with favorite character Alex Vause for season three of OITNB.

Prepon told Us Weekly at the Critics' Choice awards, "It sucked because [show creator] Jenji Kohan and I wanted me to be in it more, but with the schedule, it didn't happen. I was so bummed out. But I handled it, so I'm in every [episode] in season three. It is so good."

Prepon also spoke with E! News at the Critics' Choice Awards about how she and OITNB co-star Taylor Schilling will be filming a very 'big' sex scene soon for the third season of the hit show. Prepon said, "We're like "Girl, thank God we're so comfortable!"

"I can't say much," she added about the scene. "All the women on the show are different shapes, sizes, colours and creed - everything! So if anything on this show, it's the most comfortable I've ever been because all of us just really embrace who we are. It's wonderful. Honestly, Taylor and I are so comfortable with each other - Thank God!"