Diane played Helen - the face that launched a thousand ships - and last night she made her character proud by pulling out all the stops with this jaw-dropping look.
I believe she even managed to outshine Angelina who was on the same red-carpet with Brad.
The dress is Marchesa.
More Cannes joy to follow after Sydney Writers' Festival winds down. The best week of my year outside of summer (when every week is awesome because I'm always at the beach).