Has she downsized?!

Kylie Jenner showed off her derriére in a skin-tight jumpsuit on Feb. 11 — but her usually perky butt was seemingly tinier!

The 18-year-old's killer curves and bigger assets are speculated to be the result of plastic surgery, but the raven-haired beauty has denied claims of going under the knife.

RELATED: Kylie Jenner Suffers a Wardrobe Malfunction, Flashes Her Underwear in NYC — See Her "Marilyn Moment!"

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Don't forget, she once lied about her oversized lips before finally confessing to having lip injections.

So — does her smaller booty prove that the reality star gets injections in places other than her lips, or does this jumpsuit just magically make everything appear smaller?!

Let us know what you think!

Check out our gallery of Kylie’s butt transformation!