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There were a few tense moments on Monday's The Voice, especially for Big Bang Theory star Kaley Cuoco.

Her sister, Briana Cuoco, was on the stage singing Lady Gaga's You and I, and the four coaches were not turning their big red chairs around.

"Please! Come on!" she urged, nervously watching backstage.

Finally, Christina Aguilera hit her buzzer and swiveled around. Then Cee Lo Green did the same.

Briana seemed a little overwhelmed. "I need to sit down," she said, taking a seat on the stage steps, while her sister jumped around with happiness backstage.

Xtina told her, "You held out those notes really, really strong. You made me really happy."

Said Cee Lo, "Being with a powerful woman is one of my favorite places to be."

Whose team did Briana choose? "Girl power!" she said, pointing to Christina Aguilera

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