Slowly but surely Katharine’s McPhee’s blonde ‘do is growing on me.

Last week on “The Tonight Show with Conan O’Brien” the former American Idol contestant perform her new single “Had it All”.

She looked gorgeous commanding the stage wearing a very chic Marchesa Fall 2009 black ensemble.

The look consisted of a plunging sculptured black jacket with a cut-out star shoulder detail, paired with narrow tuxedo pants.

I love her added detail of that stunning jeweled belt.

It really adds a lot of pizazz to her look, making me love her look over the runway.

Black boots and a two-tone diamond bracelet complete the look.

This has to be one of my favourite looks from Katharine.

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Credit: Style.com & NBC