When Lorde became a pop sensation with her hit single "Royals" this summer, many were surprised to learn that the singer was just 16 years old, despite her mature appearance.

And of course, veteran child star Dakota Fanning and "Mad Men" actress Kiernan Shipka always seem poised and chic beyond their teenage years.

In fact, there are many stars we frequently forget are still very young. Browse our gallery below to see other celebs who are probably not as old as you think.

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  • Jennifer Lawrence

    Age: 23

  • Kiernan Shipka

    Age: 13

  • Lorde

    Age: 16

  • Hailee Steinfeld

    Age: 16

  • Dakota Fanning

    Age: 19

  • Chloe Grace Moretz

    Age: 16

  • Rihanna

    Age: 25

  • Kendall Jenner

    Age: 17

  • Kylie Jenner

    Age: 16

  • Shailene Woodley

    Age: 21

  • Taylor Swift

    Age: 23

  • Miley Cyrus

    Age: 20