Well, the dress has been found ... to be a fake!
The thief who took the gown says he took the dress from Lupita's room at The London after finding the door ajar.
[Image via WENN.]
Oh, hey there, we weren't expecting you!
Like some other guests, the French actress eschewed the ball gown theme and wore a beautiful navy Dior cocktail dress with circle cut-outs throughout and a plunging neckline.
Her hair won the award for "most dramatic" thanks to those thick, wavy bangs that looked sculpted onto her forehead!
Chopard jewels and silver court shoes rounded out the outfit.
We're feeling it! How ’bout U???
[Image via Getty Images.]