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‘Big Bang Theory’ Stars Kaley Cuoco and Melissa Rauch Get Super-Serious in Behind-the-Scenes Look (Photo)

Actresses from CBS sitcom offer fans a sneak peek, in all seriousness

Seriously, Kaley Cuoco and Melissa Rauch? Apparently so.

“Big Bang Theory” stars Cuoco and Rauch shared a behind-the-scenes look at this week’s episode of the CBS sitcom, and lest anyone have any doubt, the duo made it clear that they are very serious about what they were sharing with fans.

In the behind-the-scenes look, shared to both actress’ Instagram accounts Thursday, Cuoco and Rauch are seen with somber looks on their faces as they stand in the offices of Zangen, the pharmaceutical company where Penny (Cuoco) and Bernadette (Rauch) work, holding what appear to be briefing packets on a drug.

“@themelissarauch and I are very serious women doing serious business in a serious conference room on an all new seriously funny @bigbangtheory_cbs TONIGHT ,” Cuoco wrote of the photo.

Rauch, meanwhile, reflected that her closed-eye expression might not have shown seriousness as much as it did drowsiness.

“I was trying to be very serious as @kaleycuoco and I were doing very serious work business at the pharmaceutical company in tonight’s new episode of @bigbangtheory_cbs but I apparently don’t know the difference between being serious and sleeping,” Rauch wrote.

According to a CBS press release, this week’s “Big Bang Theory” finds a pair of rival physicists (guest stars Kal Penn and Sean Astin) confirming Sheldon (Jim Parsons) and Amy’s (Mayim Bialik) super asymmetry theory — thrilling at first, until they try to kick Amy off of the Nobel nomination.

Meanwhile, Bernadette “has a big success at work and Penny’s going to be a part of it — whether she wants to or not.”

What does it all mean? Share your theories in the comments section after studying the behind-the-scenes look below.