American Idol season 5 runner-up, Katharine McPhee, performed “Somewhere” at the 20th Annual National Memorial Day Concert, on the steps of The Capitol in Washington this weekend.

For her first performance she wore a floor-sweeping maxi print dress with a ruffled neckline, from Matthew Williamson’s Pre-Fall 2009 collection, which has a bohemian flair, you only get from a Matthew Williamson piece.

The dress was worn with an embellished belt, and she accessorized with a stack of gold bangles, a long necklace, and silver bauble earrings.

For her second performance, the 25-year-old singer duetted with pianist Lang Lang, performing “America the Beautiful”.

Again she wore Matthew Williamson, this time a satin taupe fitted dress, with a skirt that drapes elegantly from the waist.

I love embellished details on her sleeves, and around her waist, as it adds a touch of sparkle to this magnificent dress.

She opted out of the beaded runway necklace, instead adding a simple delicate necklace, which I prefer.

Nude ankle strap heels complete this stunning look.

Katharine was one of the many stars to attend Matthew Williamson’s New York store opening party back in February, during Fashion Week.

The store is located at 415 West 14th Street, New York, NY 10014.

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