Fashion Showdown: Katy Perry vs. Nicky Hilton

Ding, ding, ding!

In this corner, songbird and renowned girl-kisser Katy Perry, making the scene at Paper Magazine’s The Beautiful People Party 2009 in New York on Thursday.

And in this corner, Paris Hilton’s little sister Nicky Hilton, hosting an evening at Privé Las Vegas at the Planet Hollywood Resort & Casino on Saturday.

Both wearing identical blue, peacock-feather-patterned dresses by Matthew Williamson for H&M.

Two girls, one frock.

Who will emerge as the victor in this sartorial showdown?

On one hand, Perry smartly accessorized her dress with a giant pair of lips.

On the other hand, Hilton has demonstrated in the past that she can deliver a pretty fierce smackdown when she’s backed into a corner.

Readers, have your say in the poll and the comments section: Who rocked the look better?

Photo source: Getty Images/MavrixOnline