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 Pitch Perfect star looked plum-tastic in an above-the-knee Carolina Herrera dress and gray zippered clutch.
Her sweet yet sexy secretary look was completed with black Marissa Webb shoes and a simple Lorraine Schwartz tennis bracelet.
The 27-year-old usually looks like a teenager, but Anna's ensem is so mature, she actually almost looks her age here!
[Image via Ivan Nikolov/WENN.]