17 Most Powerful Stars Under 21
by Alana Altmann at . Updated at .Seventeen Magazine counts down 17 most powerful girls under 21.
1. Selena Gomez: The Mogul

Fashion icon, clothing designer, superstar singer, social media powerhouse -- Selena's entering mogul territory.
2. Demi Lovato: The Cool Chick

The cool best friend we all wish we had... and an awesome singer to boot!
3. Miley Cyrus: The Rebel

Miley Cyrus was EVERYWHERE this past year. Everywhere. Love her or leave her, she's making powerful waves.
4. Victoria Justice: The Philanthropist

This young star is making a difference.
5. Chloe Moretz: The Bodyguard

Chloe, one of Hollywood's hottest young actresses, has discussed the bullying her two gay brothers dealt with growing up.
6. Karlie Kloss: The Model on a Mission

Karlie's not just another gorgeous face. Karlie's Kookies, her cookie line, supports FEED's mission to feed the hungry.
7. Gabby Douglas: The Champion

Olympian and best selling author? Go, Gabby!
8. Lorde: The Badass

All hail Lorde, the coolest queen bee in music.
9. Cara Delevingne: The Free Spirit

Supermodel Cara's stand-out features and fun personality make for a winning combo.
10. Ariana Grande: The Social Superstar

A voice like Mariah's and hit show? Ariana is definitely a powerful young star.
11. Kate Upton: The Cover Girl

Everyone's favorite bombshell has graced countless covers this past year.
12. Ariel Winter: The Brave One

Ariel is one of the best parts of Modern Family, and she dealt with public family issues with grace.
13. Abigail Breslin: The Veteran
This child star turned teen acting dynamo can hold her own next to Meryl Streep and Julia Roberts!
14. Carly Rose Sonenclar: The Voice

The X-Factor finalist has vocals and heart.
15. Ashley Rickards: The Activist

This Awkward star was a participant in the Live Below the Line Campaign.
16. Zendaya Coleman: The Triple Threat

Zendaya can dance (she rocked DWTS), sing, and act.
17. Bridgit Mendler: The Rising Star

The multi-talented Good Luck Charlie beauty is making a household name for herself.