‘Big Bang Theory’ Star Kaley Cuoco Is Proud Of Her Younger Sister Briana

“Big Bang Theory” star Kaley Cuoco is a doting older sister to Briana.

On her Instagram account, the actress took some time out of her busy schedule to watch Briana perform in the stage adaptation of the hit movie “Mean Girls.” Cuoco posted a photo of Briana performing onstage and expressed how proud she is of her not-so-little sister. The actress also urged everyone to watch Briana in a series of performances being held at the LA Rockwell.

The Cuoco sisters are extremely close, and they have each other’s backs in all aspects of their lives. In a recent interview with Entertainment Tonight, the younger Cuoco shared what advice her older sister has given her. “Don’t be a jerk. Keep your feet on the ground. Work hard and don’t take yourself too seriously,” she said.

Read: Kaley Cuoco posts hilarious birthday greeting for Jim Parsons

Meanwhile, Briana recently starred in “Lizzie the Musical.” She also auditioned for “The Voice.” Thanks to her sister, she also guest-starred in the hit CBS sitcom. Talking about the bond that she shares with Cuoco, Briana revealed that she always shuts down those who comment negatively about her sister on Instagram.

“People can be especially mean on Instagram. I shut them down! My sister fangs come out. She actually texts me and says, ‘Sis, thanks for having my back,’” the 27-year-old said.

Earlier this year, the Cuoco siblings were spotted at the 2017 SAG Awards. Cuoco decided to bring her younger sister along because her boyfriend, Karl Cook, could not accompany her. According to the Daily Mail, Cuoco wore a pink see-through dress while Briana rocked a black gown during the event.