Here at Fab, British beauties and style icons Alexa Chung and Sienna Miller  have each claimed a place in our fashion hearts. They're both a go-to source for style inspiration, whether they're gracing a red carpet or passing through Heathrow — Alexa for her tomboy-eclectic ways, Sienna for her effortless-chic. But, when it comes to picking a favorite, we're a little divided here in the office; that's why we're leaving it up to you! Click through for 25 of Sienna and Alexa's memorable fashion moments, then cast your vote for the Brit with the best style sense.
The British beauties style up their respective takes on leopard print.
Each rocked cutoffs at Glastonbury.
For the red carpet, both dabbled in menswear.
Styling up leather in two totally different ways: Sienna takes a femme approach, while Alexa goes funky-cool.
Both give us their styled renditions of army jackets and denim.
Showing off their stripes.
They've both taken their turn in funky, boho-style striped dresses on the red carpet.
Both style up a more prim version of the LBD.
Alexa and Sienna both revealed a little collarbone in their off-the-shoulder dresses.
A pink red-carpet moment: Alexa goes '80s style, Sienna goes super funky and floor-length.
With sheer, embellished gowns in light palettes, each has her own ethereal red-carpet moment.
Taking turns in Chanel: Sienna in gold and white, Alexa in a sweet embellished tweed.
Alexa dressed up her shorts with a white blouse and heels; Sienna opted for tights and ankle boots.
Sienna played with a retro-inspired print on a sundress; Alexa tried it on a geometric-printed sheath.
Showing off their gams in cutoffs once again — this time with more dressed-up toppers.
Each sporting her own version of the leg-baring statement minidress.
Channeling vintage-inspired looks: boho for Alexa, '60s chic for Sienna.
Cool, dressed-down denim for both; Sienna tops hers with a sweet blazer, Alexa goes lacy.
Each with her take on a prim white dress.
Alexa and Sienna both stepped out in sexy little strapless dresses with sweet, baby-blue hues.
Each with her own take on black event wear — Alexa goes short and geek chic; Sienna shows off a gorgeous neckline.
Leather jackets and flowy little dresses, but Sienna styles hers over denim.
Bold-shouldered minidresses for both on the red carpet.
Sweet, printed dresses for both — on the red carpet, and off.
Both go short and red — Sienna with black tights, Alexa with sleeves and statement jewels.