PIC: Carey Mulligan Goes Back to Brunette!

Credit: Jeffrey Mayer/WireImage.com; Ron Asadorian/Splash News Online

Carey Mulligan -- is that you?

PHOTOS: Vote! What's her best hair color?

The 25-year-old Oscar nominee looked almost unrecognizable when she debuted her new chocolate hair color while out on the town in NYC with director Baz Luhrmann on Tuesday.

The actress -- who first went blonde for a film role in 2009 -- told January's ELLE UK she prefers the darker hue over her lighter locks.

PHOTOS: Vote! Which hair is best?

"I hate my hair. After An Education, I had a small part in Michael Mann's film Public Enemies and he wanted me to dye it white blonde, and it wrecked my hair," Mulligan complained. "Literally, ruined it. It was falling apart, fried. So I had to cut it off. I cried."