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.]
The supermodel worked the black carpet in a lemon-colored Louis V design featuring fluttering sleeves, a plunging embellished neckline, and thin belt.
Kate topped off the look with some killer snake skin platforms, navy clutch, fierce red lip and slicked back blonde tresses.
Our favorite part of her outfit, however, is the Louis Vuitton mask she's gripping in her right hand.
It may be a worthless accessory, but let's be real, who wouldn't want one?
[Image via Jun Sato/WireImage.]