Sienna Miller wore a baby-blue velvet dress to be her sister 's

For Savannah Miller’s wedding, maid-of-honor Sienna Miller wore an ice-blue ’90s slip. Vogue gets an exclusive first look at the dresses for the wedding.

Pregnant Sienna Miller steals the show with her bold bump-baring look as she joins lingerie-clad Jodie Turner-Smith and sleek Rita Ora for fashion's big night out in London's West End at Vogue

Pregnant Sienna Miller steals the show with her bold bump-baring look as she joins lingerie-clad Jodie Turner-Smith and sleek Rita Ora for fashion's big night out in London's West End at Vogue

Sienna Miller exudes boho chic at A Spy Among Friends premiere in a suede leather button-up blouse

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Sienna Miller in blue gown on Cannes Film Festival final night

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Sienna Miller wore a baby-blue velvet dress to be her sister 's maid of honor

Sienna Miller and Julianne Moore at Tory Burch NYFW

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Sienna Miller Wore A Baby-Blue Velvet Dress To Be Her Sister 's Maid Of Honour