Popsugar Fashion Katy Perry Katy Perry's Grammys Dresses The Katy Perry Costume Change You Might Have Missed January 27, 2014 by Hannah Weil McKinley View On One Page Photo 4 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Katy Perry's Afterparty Look The afterparties called for sexier glamour — Katy answered with this iridescent blue custom Giorgio Armani gown at the Universal Music Group post-Grammys bash. Previous Next Start Slideshow Katy PerryGrammy Awards