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2007 is shaping up to be a stellar year for official style icon of the noughties, Sienna Miller. Finally no longer mostly known as post-Sadie Jude Law's other half, the Notting Hill girl the tabloids and fash mags can't get enough of is more in demand than ever. Hot on the heels of her critically-acclaimed roles in fantasy epic Stardust and highbrow thriller Interview, La Miller has also had the time to frolic with Rhys Ifans and launch her own clothing brand, Twenty8Twelve. And who better to get busy in the cut throat world of fashion than the epitome of youthful London chic?

Sienna's daring sartorial sense, honed during a successful modelling career when she graced the hallowed pages of fashion bible Vogue Italia and featured in a Prada campaign, has earnt her the thumbs up from the style cognoscenti - single-handedly responsible for the Boho and Mod-chic revivals (who can forget those Ugg boots?), Sienna has the power to make or break a trend. Drawn to maverick up-and-coming designers as well as big names like Alexander McQueen, Alberta Ferretti and Chanel, Sienna is also a muse to the now legendary Matthew Williamson. Away from those flashing paparazzi bulbs, Miss Miller has got the laidback London look down to a T. We trawl through her style files so you can follow her fashion:

Empire line Empress

Sienna shows us how the voluminous look should be done with an achingly on-trend empire line trapeze skirted dress from her own brand, Twenty8Twelve, a clingie, boxy shrug and those lust-haves of 2007, gladiator sandals. To work the exaggerated silhouette effectively and earn top fashion points, it's all about contrast and balance; if you create volume on the lower body, combine a full skirt with a structured, fitted jacket for the perfect balance. Work it like Sienna does in this empire line mini and team with an ebony Bolero jacket. If the idea of bare legs makes you shiver, shimmery tights and silver-heel peeptoes give the look a wintrier feel.

Lust-have Leopardess

Despite featuring in a whole lot of collections over the last few seasons, the animal print refuses to go away and the leopard print is back with a vengeance this autumn/winter. Sienna yet again displays her enviable good taste with this faux fur jacket and jeans combo keeping it luxe and ladylike and avoiding any tacky Pat Butcher connotations. This fake big cat print swing jacket is just the thing to glam up a pair of skinny denims; add this giraffe print top, a pair of brown ruched or cream cuff ankle boots, a pinstripe trilby and bright red tote to complete the look.

Smart & Sleek Sienna

A more demure and less edgy Sienna shows us her ultra-sophisticated side in a simple yet stunning Chanel LBT. This satin and lace strapless bodice bandeau dress will show off your curves and the patent skinny belt will cinch in that waist. Team with the celeb bag of the moment, a clutch bag and a pair of plain black platform peeptoes. So easy, so stylish, style icon Sienna strikes again.