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.]
And she looked rather matronly in a sleeveless print Altuzarra dress with peplum detail and tassel belt.
Um, not impressed.
On the other hand, we suppose it was tea party-appropriate.
The 22-year-old accessorized with black Jimmy Choo heels, a Roger Vivier bag, and Kara Ackerman earrings.
[Image via Brian To/WENN.]