Nicole Richie joined Diane Kruger in wearing black on the red carpet at the 2011 UNICEF Ball which took place in LA last night.

The creative director for House of Harlow and Winter Kate has gone from boho, to being obsessed with Halston, to her current phase which is a very chic and sophisticated grown-up look.

Oh how she’s grown from being Paris Hilton’s sidekick.

Nicole’s Osman Fall 2011 gown has a leather cut-out bodice with a sleek black skirt with a train.

Her gown is sexy but her styling is elegant, with a simple updo, kohl-rimmed eyes and ornate earrings.

No Nicole look is complete without a clutch from her House of Harlow collection.

Which look do you prefer? The runway or Nicole’s version?

Credit: Style.com & Getty