Sienna Miller Swamped by Billowing Blue Dress: Since she shot to fame alongside Jude Law in Alfie, Sienna Miller has established herself as something of a fashion icon. Whether it’s a casual daytime look, or an evening outfit for a night out with her celebrity pals, Sienna always appears to be entirely on trend. But even icons have off days, as the 28-year-old actress proved when she arrived at a book launch wearing a billowing blue dress which did little to flatter her figure. Swamped: The blue dress Sienna Miller wore to Colin McDowell’s book launch did little to flatter her petite figure A drastic departure from the tight outfits usually favoured by the Factory Girl actress.