The actress was elegant in a black Zac Posen gown with a tone-on-tone diamond pattern effect throughout. It had just the barest hint of sheen!
We also adore the delicate sweep train and the way the one-shoulder strap forms a cap sleeve!
Isla accessorized with Stuart Weitzman heels, and jewels from Neil Lane and Jacob & Co.
We really hope she took some pictures alongside Amy Adams as well!
They were like black and white twinsies in their similar gowns!
[Image via Brian To/WENN.]