The Tonight Show is an American entertainment talk show that has been on-air since 1954. It is the longest-running regular entertainment television programme in the United States. Jimmy Fallon has been hosting the show since 2014. In this video, Jimmy hosts Kaley Cuoco, one of the stars of "The Big Bang Theory" sitcom. Kaley is going to talk about surprises she has faced on the film set for the past year, and also, along with Jimmy, she is going to answer some audience questions and even sing a song!