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! Who knew the French were so friendly??
While the cast of How To Train Your Dragon 2 were posing for photogs at their Cannes premiere, a fan was trying to make his way under a gown.
Guess he thought her full tulle skirt would be big enough to keep him hidden, but before he could make any moves underneath, security caught up with him!
Phew. That could have been a disaster! Though with America's grace, we know she would have handled it like a pro!