Which Celeb Is Baring Her Back 'n' Booty?

Normally buttoned-up actress shows off plenty of skin at the premiere of her newest film

Baby got back!

This actress is usually pretty conservative, so imagine our surprise when she hit the carpet at her movie premiere in this revealing gown.

Not only it is backless, but she's also showing us some of her rearview, too. Oh, and she obviously isn't wearing any underwear.

Think you know who pulled this white racy number? Find out after the jump:

It's Gwyneth Paltrow at the premiere of Country Strong!

Can you believe the GOOP goddess picked such a daring dress? Maybe her costar Leighton Meester's edgy fashion sense rubbed off on her.

Either way, she looks hot and it's clear that skin is in this season and undies are out.

On Sunday, Katie Cassidy also chose a long gown that also doesn't allow anything to be worn underneath.

Hey, if you got it, flaunt it!