We haven't seen much of ol' pal Sienna Miller of late, so we perked up when she popped up at the UNESCO Charity Gala in Germany in this 1940s inspired Stella McCartney pre-Fall '10 gown. There aren't too many starlets who can pull off slinky satin like this, but we think the usually scruffy Sienna does old school glam with aplomb. Bravo for the slightly dishevelled-but-still chic up-do and dazzling diamonds S, but where was your iron? Or maybe you just shouldn't have sat down in this slinky number? Crease-city! We love the lace on satin combo, but think the corrugated front kills it. Do you think love Sienna's retro style, or do the wrinkles ruin it for you, too?