David LettermanKatharine McPheeThe Late Show with David LettermanInterviewTV Appearance

Katharine McPhee interview

11 Sep, 2014

McPhee and Letterman discuss her show Scorpion on The Late Show with David Letterman.

He is the 4th smartest person in the world. He is not really challenged, he is a genius.

Katharine McPhee on "Scorpion" - David Letterman

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