Without much effort, Rihanna looked super sexy as she walked the red carpet at the 2012 Grammy Awards in LA this evening.

She had jaws dropping wearing a Giorgio Armani black silk custom gown.

The gown features a plunging neckline that is complemented by a respectable yet still daring central split. The back is dramatically open before the gown cascades into an elegant train.

Rihanna revealed that she had co-designed the dress with Giorgio Armani, and that she’s currently working on a capsule collection for the designer. Her inspiration for this dress was Michelle Pfeiffer in ‘Scarface’.

I still don’t get RiRi’s dirty blonde hair with visible roots and blunt bangs, but whilst wearing this gown, who’s checking out her hair?

Pendant necklaces, a gold clutch and Christian Louboution PVC-accented pumps completed her look.

Her makeup is flawless.

She was one of the best of the night.

Credit: Style.com & Getty