Heather wore it only a day before Kristin...

...but the question is - who wore it best?

Let's take a look:

Actress Heather Graham wore the black slash dress to the Dublin premiere of The Hangover on Monday.

She teamed it with strappy black heels and small black clutch and understated gold necklace. Her hair was kept natural and wavy and she rocked sparkly silver eye make-up and strong pink lips.

New Hills resident Kristin Cavallari wore it to ?

She styled it with leg-lengthening nude platform heels, gold bangles and simple stud earrings. Her hair was in glamourous curls swept to one side and she also chose to team her little black dress with sparkly silver eye make-up and pink lips.

So, who wore it best? You tell us - comments below please!