Katharine McPhee: The Evolution of an 'Idol'

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee at American Idol auditions in 2005.

Katharine McPhee at 'American Idol' auditions in 2005.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee at American Idol event for the Top 12 in 2006.

Katharine McPhee at 'American Idol' event for the Top 12 in 2006.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee poses for an American Idol Top 12 photoshoot in 2006.

Katharine McPhee poses for an 'American Idol' Top 12 photoshoot in 2006.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee performs on American Idol on April 25, 2006.

Katharine McPhee performs on 'American Idol' on April 25, 2006.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee attends the 17th Carousel of Hope Ball in 2006.

Katharine McPhee attends the 17th Carousel of Hope Ball in 2006.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee attends the American Music Awards in 2006.

Katharine McPhee attends the American Music Awards in 2006.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee attends the Billboard Music Awards in 2006.

Katharine McPhee attends the Billboard Music Awards in 2006.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee attends the Maroon 5 album release party in 2007.

Katharine McPhee attends the Maroon 5 album release party in 2007.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee at Vegas Magazines 4th anniversary party in 2007.

Katharine McPhee at Vegas Magazine's 4th anniversary party in 2007.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee attends the premiere of The House Bunny in 2008.

Katharine McPhee attends the premiere of 'The House Bunny' in 2008.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee attends the 30th anniversary Carousel of Hope Ball in 2008.

Katharine McPhee attends the 30th anniversary Carousel of Hope Ball in 2008.

Katharine McPhee: The Evolution of an 'Idol': Katharine McPhee attends a Matthew Williamson store opening in February 2009.

Katharine McPhee attends a Matthew Williamson store opening in February 2009.

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