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 actress was spotted in Encino getting her nails did with a friend on Thursday looking beautiful and unperturbed in a floral Free People dress, strappy wedges, and McFadin Sundance fringe shoulder bag.
We're just DYING to know if she wished Justin a happy birthday, but from the looks of it, she's not thinking about him at all!
Enjoy the single life, girl!
[Image via AKM-GSI.]