Ariana Grande and Elizabeth Gillies have been friends since their Victorious days.

They showcased their Halloween costumes on Instagram.

Grande dressed up as Nomi Malone from a 1995 thriller.

Gillies portrayed Cristal Connors, a determined showgirl.

Gillies quoted lines from the movie, adding to the fun.

Grande referenced a fiery moment from Elizabeth Berkley.

1. Last Halloween, they impressed with costumes from Best in Show.

Gillies embodied Christy Cummings, and Grande played various roles.

Their costumes were elaborate and attention-grabbing.

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