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 gorgeous singer looked lovely and ladylike at the Smurfs 2 premiere in El Lay on Sunday in a royal blue Tadashi Shoji dress with floral appliqued bodice and a flared leather skirt.
Talk about a sophisticated Smurf!
We do kinda miss the 28-year-old's awesome blue hair, but she made up for it with light blue crystal Swarovski earrings and a pair of blue satin Pedro Garcia pumps on her feet.
[Image via FayesVision/WENN.]