Katherine has also established an acting career, co-starring in The House Bunny, Shark Night 3D, and Smash.
And one of those connections led her to meet Nick Cokas.
Katharine McPhee has been playing the role of first-time mother since giving birth to her son Rennie last February.
Her ethnicity is English, German, Irish, Scottish.
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Her maiden album hit the record charts with a boom and she sold more than 100 thousand copies within the first week of the launch the album titled Katharine Mcphee.