The always cute and stylish Rachel McAdams made an interesting choice at the premiere of her film 'Midnight in Paris' at the Cannes Film Festival on Wednesday night. The petite starlet looked adorable, sporting curly blonde locks, but what was going on south of her shoulders really had onlookers gawping.

McAdams' showed up to the premiere of the Woody Allen-directed comedy wearing a barely there red silk Marchesa gown. The strategically-placed red lace over sheer mesh dress came complete with a flowing train.

But her dress wasn't the only thing turning heads. It was her first red carpet appearance with her latest beau, British actor Michael Sheen. The twosome still hasn't confirmed that they are together, but they have been spotted canoodling since last fall.

See the photo below!