Sofia Carson as Kayla
Vanessa Hudgens as Nia
Fiona Shaw as Ms. Harper (Not an important character)
Sarah Michelle Gellar as Lizzy (Not an important character)
Ariana Grande as Molly (Not an important character)
Jennette McCurdy as Avery (Not an important character)
Taylor Lautner as Casper
Tom Felton as Axel
Bella throne as Anabella
Dove Cameron as Ray
Louis Cordice as Evan
James Maslow as Kevin
And the rest of the cast as themselves.
Note_____
I couldn't get pictures of Olivia or Emma because it wasn't working but they are also not important characters.