Kim Kardashian must be rubbing off on her younger sister, Kendall Jenner -- because, at just 16-years-old, Kendall dresses like women twice her age!

On Wednesday, Kendall showed up to Russell James’ book launch for "Nomad Two Worlds" in Australia wearing a super tight "Roisin" lemon cut out bandage dress ... paired with sky-high gold heels.

The teenager, who turns 17 tomorrow, put her long legs and lean figure fully on display in the ensemble.

The aspiring model has definitely been rocking a more mature look lately -- but is she growing up too quickly?

Check out the gallery above to see more of Jenner's evolving style and then vote below in our poll.