Kylie Jenner looked like a different person when she stepped off the plane in Sydney, Australia.

The 18-year-old, who's overseas to promote her new clothing line with sister Kendall, once again sported an extremely pumped up pout, making us wonder whether she got a new set of lip fillers for the occasion.

RELATED: Kendall Jenner Sticks Her Tongue In Kylie Jenner's Mouth On Snapchat

kylie jenner
Getty Images, Splash

Kylie in Sydney on Nov. 17 (left) and Nov. 16.

The reality star's face also looked unnaturally round and smooth, suggesting that she may have had other cosmetic procedures done.

It's safe to say that we'll never really get over Kylie's rapid transformation from innocent young preteen to sexed-up Barbie doll. Scroll down for a detailed look at how her face (specifically her mouth) has changed over the years.