The actress showed off a stylish new hairdo as her friend presented his latest design
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.