And she did not disappoint in a decadent L'Wren Scott mock-neck gown with scalloped beading that hugged her curves in all the right ways!
We're just impressed the actress was able to get her hands on the dress before Nicole Kidman.
That must've taken some covert planning by her stylist. Well done!
Isla pulled her gorgeous red hair back into a low ponytail to keep the emphasis on her outfit and carried a Roger Vivier box clutch.
As much as we love the gown, we kinda wish she'd worn this at one of the Gatsby premieres.
It would've been PERF!
[Image via C. Smith/WENN.]