Ariana Grande's latest, post-Sweetener single "thank u, next" is currently enjoying its third week at number one. Over the past week, Ari's been teasing its nostalgia-packed video, which will pay homage to such blockbusters as Legally Blonde, 13 Going on 30, Mean Girls and Bring It On. On Monday night, she shared the first trailer, and it's a full on Mean Girls tribute. Ari doesn't appear in the clip, but there's some heavy wattage cameos from the likes of Jonathan Bennett (Aaron Samuels) and Troye Sivan. Check it out below.