The Big Bang Theory First Look: Zack's Back

Jim Parsons as Dr. Sheldon Cooper in

Jim Parsons as Dr. Sheldon Cooper in"The Big Bang Theory

The Big Bang Theory airs Thursdays at 8/7c on CBS.

It is official - Big Bang Theory's Melissa Rauch and Mayim Bialik will be back, joining their fellow cast members through Season 12, as they have both signed new contract deals to re-up on the hit CBS sitcom.

Bialik and Rauch finalised their deals with producer Warner Bros.

The actresses' deal comes after the show's original cast members - Jim Parsons, Johnny Galecki, Kaley Cuoco, Simon Helberg and Kunal Nayyar - reached a deal that will pay them each around $900,000 per episode. As part of the pickup, the original five stars each signed new deals and took a pay cut to support Rauch and Bialik, who have become integral parts of the Chuck Lorre-Steve Molaro comedy. According to insiders with knowledge of the negotiations, the deal will pay Bialik and Rauch $500,000 per episode for 48 episode.

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A representative for Warner Bros. Their most recent contract had them earning $175,000 to $200,000 per episode, but they were reportedly seeking a little under $1 million per episode like their other co-stars.

Before that it had been reported that CBS was working on coming to an agreement with the cast about salaries. Bialik has earned four consecutive supporting comedy actress Emmy nominations for playing Amy Farrah Fowler, girlfriend of Parsons' Sheldon Cooper.

Bialik and Rauch both joined The Big Bang Theory in season three and were promoted to regulars a year later. She wrote on the caption that a decade of the series has now passed, allowing fans to think that season 10 would be the last for the show. Bialik is also with manager Tiffany Kuzon of Primary Wave Entertainment and attorney Shep Rosenman.

The 31-year-old also posted a second photo, taken outside Sheldon and Leonard's apartment, featuring all the stars of the show and teased: "See you next season".