New mum Sienna Miller had a well-deserved night on the town on the opening night of the Tribeca Film Festival
Sienna Miller took her soon to be sister-in-law, Matilda Sturridge, as her date to the opening night of the Tribeca Film Festival.
With boyfriend Tom Sturridge unable to attend due to work commitments, Sienna, 31, called on Matilda to be her plus one to the Vanity Fair party in New York.
Both gorgeous ladies opted for simple black dresses as they held hands and posed for the waiting photographers.
Sienna, who is currently based in New York while Tom stars in Orphans on Broadway, accessorised her LBD with a pair of gorgeous satin heels and a shoulder box bag.
Other stars at the event included a heavily pregnant Evan Rachel Wood, Karolina Kurkova, Zac Posen and Donna Karan.
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