If she didn't actually get any form of plastic surgery, then Kylie Jenner's ever-changing face is one of life's greatest mysteries.

The 17-year-old shocked the world with her new look in 2014, but most of the attention surrounded her noticeably fuller pout. The change was so drastic that the reality star was left defending herself time and time again.

READ MORE: Kim Kardashian Forgets Her Underwear in See-Through Pants

Now, Kylie's lips appear to have shrunk back down to their (somewhat) original size — in a rare photo posted on Instagram where she's seen smiling from ear to ear with a friend.

kylie jenner plastic surgery
Instagram

Meanwhile, just days ago, her lips were looking all plump in this seductive selfie:

kylie jenner
Instagram

But alas, the 'Keeping Up With the Kardashians' star is sticking to her guns.

READ MORE: Kylie Jenner Looks Unrecognizable in Shocking New Photo — No Seriously, Who is This Girl?

“You guys have watched me grow up since I was 9. My face is going to get different," she recently told 'Cosmo.' "I’m not against surgery. I’d never say no, but I don’t desire it right now.”

Whatever you say, Jenner. We'll just let these photos do the talking.

kylie jenner plastic surgery 2
Getty, Instagram

Left, 2012. Middle, last week. Right, today.