Who she is: Ariana Grande
How you know her: Ariana is slowly winning the hearts of tweens across America, with songs like "Put Your Hearts Up" and "Problem." She also starred in her own Nickelodeon show, Sam and Cat.
Why we love her: Ariana's got some attitude on the red carpet, and she loves to play with colors. Remember those fluorescent blue nails she rocked while performing at the VMAs?