Katy Perry dress necklace moca city of hope singer Did someone tell her it was a roaring 20's party?!

Katy Perry attended the City of Hope Spirit of Life Awards Gala at MOCA in Los Angeles last night, and the "Wide Awake" singer channeled a flapper in an orange satin dress, pearls, and an ornate headband. We love this California girl, but it looks a little like she's wearing a nightgown!

The 27-year-old pop star is gearing up for the release of her documentary Part of Me 3D , set to hit theaters July 5 nationwide. The film captures the the quirky brunette's rise to stardom, and will also document the downfall of her marriage to comedian Russell Brand.

We wonder what Rusty Rockets thinks of his ex splashing their personal life on the big screen?