Kylie Jenner is slamming those pregnancy rumors the only way she knows how — by posting a sexy selfie on Instagram!

The 19-year-old reality star is reportedly expecting her first child with boyfriend Tyga, 26, but her latest photo proves she is not hiding a baby bump.

MORE: Kim Kardashian Makes Her Return to Instagram — and Paris Hilton is Involved!

Wearing a nude sports bra with matching underwear, the lipstick maven shows off her flat tummy and tiny waist in the revealing undergarments.

Before breaking her silence, Kylie coincidentally skipped an appearance on The Late Late Show due to an illness, prompting many to believe she really was pregnant.

MORE: Plastic Surgery? See the Kardashian Family Transform Before Your Eyes

However, the proof is in the picture.

For more of Kylie’s sexiest Instagram moments, check out the gallery below!