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.]
Wow! We're almost speechless!
The 25-year-old wore a black dress with large side cut-outs that opened to reveal some epic side vag! We're STUNNED!
Luckily, Rumer wore some pink undies underneath to keep from showing too much!
Why not black undies, though? We have no idea.
[Image via FayesVision/WENN.]