“The Big Bang Theory” star Kaley Cuoco felt like a winner on the U.S. talent show “The Voice” when her sister Briana Cuoco made it to the blind audition. Briana wowed on stage with her rendition of Lady Gaga’s “You and I,” prompting two judges to turn their chairs around.

“Please! Come on!” Kaley, 27, pleaded to no one in particular as she watched her younger sister in the backstage with her parents.

Dressed in dark leather jacket and grey shirt, 24-year-old Briana totally looked the part of a rock star when she entered the stage. But looks are nothing in the show’s blind auditions so no matter how good looking she was, she had to sound the part as well.

Fortunately, Briana has the talent to impress judges Christina Aguilera and Cee-Lo Green.

Christina pressed her button about one minute into her performance, while Cee-Lo, at judge Adam Levine’s urging, also pressed the button a short time before Briana concluded her song.

An ecstatic Kaley was seen jumping up and down with delight, clearly very, very happy for her equally beautiful, and, as just proven, talented sister.

“Sometimes you are sitting in your seat and you’re struck by the subtleness of a vocal,” Christina said of Briana’s singing. “And then sometimes you’re just moved by power and raw talent. I really enjoyed it.”

“Bri, I’m just a man,” Cee-Lo pleaded to her. “I felt power in your voice as well, and I want to be closer to it. Being close to a powerful woman is one of my favourite places to be.”

Because both Christina and Cee-Lo turned their chairs around, Briana had to choose which judge she would like to be her mentor. She ultimately went with Christina.

The judges didn’t seem to be aware of Briana’s connection to Kaley during the audition. And to erase anyone’s doubts that Briana made it on her own, her famous sister set the record straight.

FYI last nights #TheVoice was NOT rigged because I'm @bricuoco sis. She made it ON HER OWN 100%. It's called BLIND AUDITIONS for a reason

— Kaley Cuoco (@KaleyCuoco) October 1, 2013

Briana is her sister’s personal assistant, but she made it clear that she has a life of her own and would be happy to live it.

“This is what I want to do with my life – I don’t want to make appointments, take the dogs for a walk, call the plumber,” she said before her performance.

“I believe I’m meant to do this for the rest of my life and hopefully this will be the beginning of the journey.”

Kaley didn’t mind losing an employee, though.

“I’ve been waiting for something like this for so long for her,” she told host Carson Daly. “She has deserved this her whole life. She’s always put herself on the back-burner for everyone else. This is her time now.”

Watch Briana performing for judges Christina, Cee-Lo, Adam, and Blake Shelton while Kaley cheers her on backstage:

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