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 Sundance Channel-hosted soiree at West Hollywood's Soho House, the Duchess strut her stuff in a bedazzled Balmain tee, leather shorts and Fergie Footwear heels.
All that's missing was a motorcycle and Fergie Ferg would be set!
[Image via Patrick McMullan/AP Images.]