All change! Sienna Ditches Designer Frock at Met Afterparty

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POSH FROCK: Sienna as she arrived with Jude

Not only is the annual Costume Institute Gala Benefit one of the biggest nights in the fashion calendar but as it was Sienna Miller and Jude Law’s first public outing since they got back together you’d think they’d be extra vigilant about how they appeared in front of the press.

You thought wrong!

While Jude and Sienna arrived at the bash to celebrate the opening of the American Woman: Fashioning a National Identity exhibition at The Metropolitan Museum of Art looking totally slick – him in black tie, her in a plunging navy Pucci dress – Sienna was quick to ditch the fancy frock as soon as she had the chance.

For the afterparty she slipped into her skinny jeans and a loose asymmetric-hemmed T-shirt – and still looked gorge by the way – which was a bit under-dressed compared to the other A-list ladies who were still decked out in designer gowns.

Fair enough Sienna, maybe she just wanted to be comfy, and a good pair of jeans is like settling back into an old, familiar relationship – a bit like what she has with Jude!

QUICK CHANGE: Sienna steps out for the afterparty