"Happy Halloween. We did this in May," pop star Ariana Grande and actor/singer Liz Gillies posted on Instagram on 28 October while wearing costumes that recreated famous scenes from the 2000 mockumentary comedy film Best in Show.

Grande and Gillies — who were previously in the cast of the Nickelodeon show Victorious — captioned a series of photos and videos of themselves, with Gillies as Jane Lynch's character Christy Cummings, and Grande as Jennifer Coolidge's Sherri Ann Cabot in Best in Show.

Then Grande transformed into Eugene Levy's Gerry Fleck — complete with eyebrows — while Gillies channeled Catherine O'Hara's curly haired Cookie Fleck.

Coolidge commented: "This is f***ing great. I was gonna go as the young boy's pet weasel from The Watcher, but now I think I'm gonna go as @arianagrande's dog Toulouse."

Grande and Coolidge appeared in the pop star's 2018 "Thank U, Next" music video.

Grande stars in the coming live-action Wicked movie adaptation. She and Gillies likewise performed in the Broadway musical 13.