14/08/2014 16:36 BST | Updated 22/05/2015 10:12 BST

Sienna Miller Wears Skinny Jeans, No Makeup And Still Looks Amazing At Isabel Marant For H&Amp;M Preview Party

Had we been on the guestlist for the Isabel Marant collection for H&M launch party on Wednesday eve, we'd had fussed for hours about what to wear and would have obviously booked in to get our hair and make-up done.

But when your name is Sienna Miller, a stalwart of the fashion party scene and a flawless natural beaut, such fuss is really not necessary.

The 30-year-old mum of one and face of Burberry rocked up to the swish party in her go-to skinny jeans, slightly beaten up suede booties, a Marant cardi from the collection (obvs) and NO MAKEUP.

What the? Had we done the same, we'd have been given a short shrift and been marched to the nearest exit, but Sienna somehow managed to make this outfit super chic and off-the-cuff cool. And as for the non-existent make-up - you don't need any cosmetic trickery when you're this flawless.

If you need us, we'll be weeping in a corner somewhere.

Enjoy more from the Sienna archive below...