12 Adorable Teen Singers, Then And Now

They grow up so fast.

1. Ariana Grande

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Kevin Winter / Getty; Jason Merritt / Getty

At age 16 and age 21.

ID: 3690543

2. Hilary Duff

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Gregg DeGuire / WireImage, Steve Granitz / WireImage

At age 14 and age 26.

ID: 3691308

3. Justin Bieber

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Jason Merritt / Getty; Ari Perilstein / Getty

At age 15 and age 20.

ID: 3692298

4. Selena Gomez

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Charley Gallay / Getty; Michael Kovac / Getty

At age 15 and age 22.

ID: 3699819

5. Demi Lovato

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Kevin Winter / Getty; Busacca / Getty

At age 16 and age 22.

ID: 3692447

6. Nick Jonas

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Gregory Pace/BEImages; Ethan Miller / Getty

At age 15 and age 21.

ID: 3700156

7. Miley Cyrus

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Michael Buckner / Getty; Larry Busacca / Getty

At age 14 and age 21.

ID: 3693347

8. Taylor Swift

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Peter Kramer / Getty; Jason Merritt / Getty

At age 16 and age 24.

ID: 3693366

9. Rihanna

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Peter Kramer / Getty; Bryan Bedder / Getty

At age 17 and age 26.

ID: 3693801

10. Robyn

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Tim Roney/Hulton Archive / Getty Images; Steve Granitz / WireImage

At age 16 and age 33.

ID: 3701379

11. Christina Aguilera

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Brian Rasic / Rex USA; Jamie McCarthy / Getty

At age 19 and at age 33.

ID: 3702718

12. Isaac Hanson

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Roger Sargent / Rex USA; David Livingston / Getty Images

At age 17 and age 32.

Dang, Isaac. Dang.

ID: 3703001