Kris Jenner
She's not a regular mom, she's a cool mom! The Keeping Up With the Kardashians momager plays Regina George's mom in the Mean Girls segment.
Jennifer Coolidge
They're taking the dog, dumbass! The Legally Blonde actress reprises her iconic role to star opposite Ariana's re-imagination of Reese Witherspoon's Elle Woods.
Troye Sivan
"I heard she's a lesbian now and dating some girl named Aubrey," the singer-songwriter riffs in the music, satirizing Mean Girls and referencing the mistake Apple Music made in publishing the lyrics to "Thank U, Next."
Colleen Ballinger
The YouTube star and comedienne rocks her baby bump for the Bring It On-inspired portion of the wildly popular visual.
Matt Bennett
Grande's other Victorious co-star is the Cliff to her Torrence in the Bring It On part of the video.