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.]
For the London event, Marion predictably opted for a navy and black Christian Dior high-low gown and white pumps.
Like her last navy frock, we can't say we're too impressed with this ensemble.
It's definitely time for Marion to start
seeing other people wearing different designers.
[Image via Jon Furniss/AP Images.]