Amal Clooney: Trainwreck at Cannes

Amal Clooney's dress made her a dead ringer for Belle at the Cannes Film Festival ... until the long flowing train on her dress decided to go rogue.

Amal was dressed to kill Thursday for her husband George Clooney's "Money Monster" premiere. Julia Roberts, Jodie Foster and Dominic West were there too, but Amal's dress brought the procession to a halt. It's cool ... she had George to rescue her.