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 Mad Men actress walked the grassy carpet in an abstract floral print Sam & Lavi dress worn with a knee-length tan coat.
January also made sure to bring her Coach accessories, opting for navy houndstooth heel sandals and a perforated swingpack.
A coral lip and braided up-do completed January's very spring-appropriate look.
[Image via AP Images.]