Former "American Idol" contestant Katharine McPhee and "Chuck" star Zachary Levi teamed up for an unlikely collaboration -- a duet.

Katharine McPhee and Zachary Levi Team-up for Duet
The two recorded a new version of "Terrified" -- a song originally on Kat's "Unbroken" album featuring folk singer Jason Reeves.

FYI -- the track was penned by "Idol's" very own Kara DioGuardi.

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