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    12 Adorable Teen Singers, Then And Now

    They grow up so fast.

    1. Ariana Grande

    Kevin Winter / Getty; Jason Merritt / Getty

    At age 16 and age 21.

    Kevin Winter / Getty; Jason Merritt / Getty

    At age 16 and age 21.

    Kevin Winter / Getty; Jason Merritt / Getty

    At age 16 and age 21.

    2. Hilary Duff

    Gregg DeGuire / WireImage, Steve Granitz / WireImage

    At age 14 and age 26.

    Gregg DeGuire / WireImage, Steve Granitz / WireImage

    At age 14 and age 26.

    Gregg DeGuire / WireImage, Steve Granitz / WireImage

    At age 14 and age 26.

    3. Justin Bieber

    Jason Merritt / Getty; Ari Perilstein / Getty

    At age 15 and age 20.

    Jason Merritt / Getty; Ari Perilstein / Getty

    At age 15 and age 20.

    Jason Merritt / Getty; Ari Perilstein / Getty

    At age 15 and age 20.

    4. Selena Gomez

    Charley Gallay / Getty; Michael Kovac / Getty

    At age 15 and age 22.

    Charley Gallay / Getty; Michael Kovac / Getty

    At age 15 and age 22.

    Charley Gallay / Getty; Michael Kovac / Getty

    At age 15 and age 22.

    5. Demi Lovato

    Kevin Winter / Getty; Busacca / Getty

    At age 16 and age 22.

    Kevin Winter / Getty; Busacca / Getty

    At age 16 and age 22.

    Kevin Winter / Getty; Busacca / Getty

    At age 16 and age 22.

    6. Nick Jonas

    Gregory Pace/BEImages; Ethan Miller / Getty

    At age 15 and age 21.

    Gregory Pace/BEImages; Ethan Miller / Getty

    At age 15 and age 21.

    Gregory Pace/BEImages; Ethan Miller / Getty

    At age 15 and age 21.

    7. Miley Cyrus

    Michael Buckner / Getty; Larry Busacca / Getty

    At age 14 and age 21.

    Michael Buckner / Getty; Larry Busacca / Getty

    At age 14 and age 21.

    Michael Buckner / Getty; Larry Busacca / Getty

    At age 14 and age 21.

    8. Taylor Swift

    Peter Kramer / Getty; Jason Merritt / Getty

    At age 16 and age 24.

    Peter Kramer / Getty; Jason Merritt / Getty

    At age 16 and age 24.

    Peter Kramer / Getty; Jason Merritt / Getty

    At age 16 and age 24.

    9. Rihanna

    Peter Kramer / Getty; Bryan Bedder / Getty

    At age 17 and age 26.

    Peter Kramer / Getty; Bryan Bedder / Getty

    At age 17 and age 26.

    Peter Kramer / Getty; Bryan Bedder / Getty

    At age 17 and age 26.

    10. Robyn

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

    At age 16 and age 33.

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

    At age 16 and age 33.

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

    At age 16 and age 33.

    11. Christina Aguilera

    Brian Rasic / Rex USA; Jamie McCarthy / Getty

    At age 19 and at age 33.

    Brian Rasic / Rex USA; Jamie McCarthy / Getty

    At age 19 and at age 33.

    Brian Rasic / Rex USA; Jamie McCarthy / Getty

    At age 19 and at age 33.

    12. Isaac Hanson

    Roger Sargent / Rex USA; David Livingston / Getty Images

    At age 17 and age 32.

    Dang, Isaac. Dang.

    Roger Sargent / Rex USA; David Livingston / Getty Images

    At age 17 and age 32.

    Dang, Isaac. Dang.

    Roger Sargent / Rex USA; David Livingston / Getty Images

    At age 17 and age 32.

    Dang, Isaac. Dang.