He played his fiancé's character Sansa from Game of Thrones while she walked out as a plain-old elephant.
The accessories really helped the couple pull of their looks as fashion icons Karl Lagerfeld and Anna Wintour.
She went with a Día de los Muertos-inspired look while he donned a baseball player costume.
As the hosts of their annual Casamigos Halloween party, they had to impress the crowd.
The family put some serious thought into their costumes.