Pop Tarts

Katharine McPhee to Simon Cowell: I Don't Want to Hear It!

Katharine McPhee

Katharine McPhee  (AP)

Katharine McPhee certainly shook things up a bit in 2009 by shedding her “old long brunette look” and opting for a hot blonde crop. But one opinion on the look that the “Idol” alum has no interest in hearing is that of Simon Cowell’s.

“He hasn’t seen it yet and [I] wouldn’t really value or want to know his opinion about hair,” McPhee told Tarts very bluntly at City of Hope’s “12 Stops at Christmas” event in Hollywood recently. “I spent a year and a half working on the record and this (the new hair) was an expression of me figuring out what I wanted to do. I think it’s a phase so we’ll see how long it lasts for, but right now I’m having fun.”

And this isn’t the first time the two have made their not-so-affectionate feelings for one another known.

SLIDESHOW: Katharine McPhee Better Blonde or Brunette?

“Didn't care much about Katharine McPhee," Cowell told Extra last year. "I don't think she was a credible recording artist. Katharine will end up on Broadway!"

But McPhee has proved the caustic critic wrong having just released her sophomore album “Unbroken.”

“It definitely is a departure from my first record and I got to take a lot of time on this record and really figure out who I wanted to be and what I wanted Katharine McPhee to sound like. It was really connected to who I am. I wrote about half the record, it’s a lot more personal,” she explained.

Hollie McKay has been a FoxNews.com staff reporter since 2007. She has reported extensively from the Middle East on the rise and fall of terrorist groups such as ISIS in Iraq. Follow her on twitter at @holliesmckay