Looks like Katy Perry took a style note from Kate Middleton for last night's Change Begins Within benefit at New York's Metropolitan Museum. She wore Issa, the designer who clothed Middleton in a navy wrap dress that instantly sold out when the future princess wore it while announcing her engagement to Prince William late last month.

Perry's long printed dress featured an asymmetrical neckline and a black, silver, red and white crisscross pattern.

The pop star, who recently became the first woman in 11 years to score three No. 1 pop singles from the same album, paired the gown with long black locks slightly parted to the side, a pair of sparkly bracelets, shiny round-toe satin pumps -- and her all-black-clad new hubby, Russell Brand, who rocked a velvet blazer.

This more elegant ensemble comes a few days after Perry wore a bevy of very sexy Christmas outfits -- including ensembles evoking a scantily clad Mrs. Claus, pantless toy solider and snowman -- to the Z100 Jingle Ball in Miami.

In related news: Check out Perry's new line of colorful nail polishes for OPI, which comes out next month.