Kourtney Kardashian Shows Off Body in Ab-Baring Jumpsuit at Kylie Jenner's 18th Birthday

Is this Kourtney's revenge body?

Just like Khloe Kardashian, you could say her sister Kourtney has a "revenge body" too. 

Ever since her recent split with Scott Disick, the Keeping Up With the Kardashians star has been sharing pics of how she's been relentlessly working out -- and the results are definitely showing!

Check out this black cut-out jumpsuit she wore to little stepsister Kylie Jenner's 18th birthday party on Sunday night.

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The mother of three was spotted outside of Nice Guy in Los Angeles, California, where her abs were on full-display in the sexy onesie.

But this wasn't her only revealing weekend look. Kourtney also posed with her sister Kim on Saturday in cleavage-baring body suits.

Not to be outshined by Kourtney and Kim, the birthday girl entered adulthood with a very risqué photo of her own.

Kylie's rumored boyfriend Tyga posted a steamy pic of  "the dopest girl ever" to wish her a happy birthday. Not to mention, he also gifted her with a $320,000 Ferrari.

MORE: Kylie Jenner Turns 18 at Club, Gets a $320K Ferrari From Tyga 

Happy Birthday to Kylie!

Check out the video below to see more on her birthday plans.