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Kelly Clarkson says she's not an actress, but sometimes she thinks Hollywood producers don't realize this.  The singer explains it's why she initially turned down an offer to appear in the series premiere of Robin Williams' new comedy, "The Crazy Ones." 

Williams has the role of advertising executive Simon Roberts on "The Crazy Ones." 

In the premiere episode Simon lands an account with a major fast food restaurant, and enlists Kelly to appear and sing in his commercial. 

"The Crazy Ones" launches on CBS Thursday at 9:00 p.m. Eastern.