[Image via WENN.]
Not only does this gurl have an AH-Mazing voice, she has some great dance moves to back it up on stage!
To prepare for the special surprise, Ari tweeted on Tuesday night:
Don't forget if you wear a Halloween costume to @JimmyKimmelLive tonight you could possibly get a very special surprise… X
— Ariana Grande (@ArianaGrande) October 15, 2013
After a long and daunting search for the best costume, three of her biggest and best dressed fans were chosen and brought on stage.
Little did they know that the surprise was right beside them on stage!
Ch-ch-check out the hilarious surprise (above)!!