Kylie Jenner 30 Going On 17

Kylie Jenner hopped in a time machine, and POOF -- just like that she looked like a real life regular 17-year-old again ... a much different look than she's been flaunting lately.
Kylie was refreshingly makeup-free while hanging out with her sister Kendall ... who was doing a
photo shoot Tuesday in Malibu.

In recent weeks she's tried out a lot of different looks -- some with less success than others -- but this one might be most revealing of all. Imagine that ... a 17-year-old who actually looks 17.