Katy Perry In Giambattista Valli Couture - 2013 White House Correspondents' Association Dinner

Katy Perry was on her best fashion behavior at last night’s White House Correspondents’ Association Dinner in Washington, D.C.

She wore a conservative (for her!) Giambattista Valli Fall 2012 Couture silk draped gown.

Recently embarking on a blue-infused ‘The Smurfs 2′ promo circuit, the chameleon-like songstress changed her colours with this moss-green dress, which was a gorgeous hue with her jet-black locks.

I barely recognized the stripped-down version of this design from its runway predecessor, so covered it was in an embarrassment of flora and fauna.

She did keep one element of Katy-like quirk in the look in homage to the runway’s theatrical forest—the branch-inspired bronze belt. But it only whispered of the dress’s original garden state.

I could actually see the more free-spirited fashion side of Katy wearing the butterfly headpiece, but I’m glad she didn’t on this occasion.

Even her makeup, a classic winged eye and pink lip, was on the subdued side.

Credit: Style.com & Getty