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 11 month old big sister-to-be stole the spotlight from her mommy, who showed off her growing belly in a burgundy dress from the Jessica Simpson Maternity collection, while sitting on the table between autograph signings and flashing her cute pout.
She definitely got it from her mama!
And if we didn't know any better, it looks like Maxwell's 'do was heavily inspired by Auntie Ashlee's stylish bun.
[Image via Getty Images.]