Kaley Cuoco
Kaley Cuoco is extremely proud of her boyfriend, Karl Cook. Pictured: Kaley Cuoco at The Paley Center for Media's 33rd Annual PALEYFEST in Hollywood, California on March 16, 2016. Getty Images/Matt Winkelmeyer

Kaley Cuoco recently shared an adorable photo with her younger sister Briana via Instagram.

On Sunday, “The Big Bang Theory” actress was photographed wearing an all-denim ensemble. Her 27-year-old sister also wore a similar outfit, but instead of shorts, she wore dark-colored jeans. “Sisters wearing too much denim,” Cuoco captioned the snap, which only showed the back view of the actress and Briana. The latter also posted the same image via her Instagram account and wrote “sister//sister” as her caption.

Cuoco and Briana have a very close relationship with each other. In fact, the latter previously shared that it was her older sister who encouraged her to pursue a career in music by auditioning on “The Voice” a few years back. While speaking with Entertainment Tonight earlier this year, Briana also shared the biggest and most helpful advice Cuoco gave to her. “Don’t be a jerk. Keep your feet on the ground. Work hard and don’t take yourself too seriously,” she said.

During the interview, Briana also said that she typically defends her older sister when the latter receives nasty comments on social media. In return, Cuoco will text Briana and thank her for always having her back.

In other news, “The Big Bang Theory” Season 10 will air its second episode on Monday night. In the teaser released by CBS for “The Military Miniaturization,” Howard (Simon Helberg) will receive a visit from the Air Force One, who wants to fund his latest research. However, Howard is worried that his invention will be used to make weapons.

Additionally, Penny (Kaley Cuoco), Amy (Mayim Bialik) and Bernadette (Melissa Rauch) will discuss the latter’s pregnancy. Bernadette is not happy with the fact that her assistant knows she’s pregnant. As it turns out, Penny was the one who blabbed the news.

“The Big Bang Theory” Season 10, episode 2 will air on CBS on Monday, Sept. 26 at 8 p.m. ET.