KATY PERRY sparkled in an iridescent Blumarine gown at the 2012 Billboard Music Awards on Sunday.

Check her out:

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The “Part of Me” singer, who brought her grandmother Ann Hudson as her “date” to the star-studded event, apparently decided to build her entire outfit around the color of her hair… so it was purple all the way.

Katy poured her ample curves into an iridescent pale lavender Blumarine backless gown adorned with dazzling studs and sequins, which she accessorized with a collection of spiky silver bangles from Misaki.

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Then, for hair and makeup, Katy opted for big curls, a dark plum lip color, and neutral eyeshadow complemented by thick lashes.

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The result? A monochromatic, fairy princess look with just a hint of goth.

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Photos By PR Photos

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