In What Movie Should Selena Gomez Have Replaced A Character?

Just for fun. Love you!

STATE:
-The Movie (full title)
-The Original Character (actor/actress and description of their character they played)
-Why would Selena Gomez Have Been Better At Acting The Character Than This Actor/Actress?

MY PICK:
-I Am Number Four (not out yet, but I've seen every trailer)
-Diana Agron (Sarah- in love with Number 4, dramatic girl)
-Selena would have been better because Selena is firstly beautiful, secondly-super dramatic, and thirdly easy to stay on her side (rather than the evil person's side etc.)

Hope you enjoy answering this question <3 <3