Sienna sparkled on the red carpet in her jade sequin dress at the MTV Movie Awards and we've hunted it out on the high street.

Sienna is the queen of cool party style and she shows us just how a sequin backless minidress should be worn. 

She accessorises it with a simple white Chanel clutch, metallic heels and black statement earrings.  Her golden locks are kept loose and flowing and her make-up is fresh and  natural.

We bet Sienna's cost a fortune, but there's no point in splurging on a designer frock, when this high street version looks so darn fabulous!

It looks almost identical and has a deep v-neck on the back, so you don't have to flash too much flesh.

Jade sequin dress, £50, Dorothy Perkins

Are you loving Sienna's red carpet look?  Will you be bagging this dress for your next party? Comments please!