Rachel Bilson Steps Out in Wacky Bra-Baring Dress

Credit: Charles Eshelman/FilmMagic

Love it or hate it?

Rachel Bilson showed off her petite figure in a bizarre bra cut-out Preen frock at the premiere of her new flick, Waiting for Forever, in NYC Thursday. (The actress, 28, also donned nude Brian Atwood pumps.)

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The back of the cream colored gown featured a bright yellow neon stripe of fabric.

PHOTOS: Rachel at the premiere

Bilson -- who has been engaged to her Jumper costar Hayden Christensen, 28, since February 2009 --  recently admitted to Cleo magazine that she's obsessed with shopping.

PHOTOS: Stars' HUGE engagement rings

"I'm not a shopaholic in the sense that I spend lots of money; I definitely love vintage and I love finding deals just like anyone else. But I do like to shop!" she said.