Kaley Cuoco challenged to sing theme song

Name: Kaley Cuoco challenged to sing theme song
Uploaded: 2017-05-05T10:00:18+00:00
Description: On "The Tonight Show," actress Kaley Cuoco was challenged to sing the theme song of the "Big Bang Theory."

Collected by CNN on May 5, 2017

On "The Tonight Show," actress Kaley Cuoco was challenged to sing the theme song of the "Big Bang Theory."

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