The actress showed off a stylish new hairdo as Matthew Williamson presented his latest design

Sienna Miller debuts new fringe as fashion pack come out for Matthew Williamson bash

Earlier this month, she wowed at the Costume Institute Gala in a navy blue dress as she and beau Jude Law went public with their rekindled romance.

And this week, Sienna Miller got the flashbulbs going again as she showed off a chic new hairdo at a party hosted by her designer friend, Matthew Williamson.

Her new bangs weren't the only fashion-forward part of Sienna's look, though.

The Factory Girl actress dressed smartly from head-to-toe, wearing a lovely gold draped frock with black platform sandals, which she topped off with bold, red lips.

Also celebrating with Matthew was a fashionable crowd that included her sister, Savannah, Peaches Geldof and style icon Twiggy.

And while Sienna arrived without Jude - her main companion these days - she looked completely at ease in the company of her pals as they shared plenty of hugs and laughs throughout the night.