These to A-List leading ladies wore the same Zac Posen dress on the red carpet...

But who do you think wore it best?

We love how these curvy ladies look in their long black dresses,

Kate wore hers way back in February to The Orange British Academy Film Awards...

With her hair up, long sparkly earrings and a diamond bracelet, Kate looked every bit the gorgeous gal - it's no wonder that she won The Leading Actress award at the ceremony!

Mariah Carey wore her dress this month (November) to the premiere of Precious - her latest film. With her long locks down and curly, she had a different look to Kate. Instead of statement earrings Mariah opted for small studs and wearing the bling on her finger... look at that rock!

So it's up to you Scapers, who do you think wore it best? The British beauty with her hair up or the American Diva with her hair down?

- For more who wore it best pictures click here! -

Comments please...