Kourtney Kardashian shows off body in ab-baring jumpsuit at Kylie Jenner's 18th birthday

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Kourtney Kardashian Stuns in Revealing Black Jumpsuit

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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Like the look? Check out wearable black cut-out jumpsuits from Shopbop and Nasty Gal.

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.

28 PHOTOS
Kourtney Kardashian and her family
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Kourtney Kardashian shows off body in ab-baring jumpsuit at Kylie Jenner's 18th birthday
LAS VEGAS, NV - FEBRUARY 21: Television personalities Scott Disick (L) and Kourtney Kardashian appear at 1 OAK Nightclub at The Mirage Hotel & Casino on February 21, 2015 in Las Vegas, Nevada. (Photo by David Becker/WireImage)
LAS VEGAS, NV - MAY 23: Television personality Kourtney Kardashian attends Scott's birthday celebration at 1 OAK Nightclub at The Mirage Hotel & Casino on May 23, 2015 in Las Vegas, Nevada. (Photo by Steven Lawton/FilmMagic)
Madly in love with my little Reign Aston Disick.
BRIDGEHAMPTON, NY - AUGUST 09: TV Personality Kourtney Kardashian and husband Scott Disick attend Women's Health Hosts Hamptons 'Party Under The Stars' for RUN10 FEED10 at Bridgehampton Tennis and Surf Club on August 9, 2014 in Bridgehampton, New York. (Photo by Paul Zimmerman/Getty Images for Women's Health)
WEST HOLLYWOOD, CA - MARCH 02: Television personalities Kim Kardashian (L) and Kourtney Kardashian attend the 22nd Annual Elton John AIDS Foundation Academy Awards Viewing Party at The City of West Hollywood Park on March 2, 2014 in West Hollywood, California. (Photo by Jamie McCarthy/Getty Images for EJAF)
NEW YORK, NY - JUNE 12: Kourtney Kardashian and Scott Disick are seen in Sag Harbor on June 12, 2014 in New York City. (Photo by David Krieger/Bauer-Griffin/GC Images)
NEW YORK, NY - JUNE 26: Kourtney Kardashian,Kendall Jenner and Kris Jenner are seen in the Meat Packing District on June 26, 2014 in New York City. (Photo by Alo Ceballos/GC Images)
LAS VEGAS, NV - NOVEMBER 07: Kris Jenner (R) and Scott Disick (L) celebrates Kris Jenner's birthday at 1 OAK nightclub at the Mirage Hotel and Casino on November 7, 2014 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LOS ANGELES, CA - SEPTEMBER 26: Kourtney Kardashian and Scott Disick are seen on September 26, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 08: (L-R) Kourtney Kardashian and Kim Kardashian attend as Nicole Richie, Rivka Sophia Rossi, Hayden Slater and friends host Marianne Williamson, Independent Candidate for Congress, CA 33 event at Kayne Griffin Corcoran Gallery on April 8, 2014 in Los Angeles, California. (Photo by Tibrina Hobson/Getty Images)
LOS ANGELES, CA - OCTOBER 16: Scott Disick and Kourtney Kardashian are seen on October 16, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
NEW YORK, NY - FEBRUARY 16: Harry Smith, Kim Kardashian, Kourtney Kardashian and Khloe Kardashian attend the Generation NXT charity benefit at 1OAK on February 16, 2014 in New York City. (Photo by Dave Kotinsky/Getty Images)
NEW YORK, NY - MAY 31: (L-R) Television personalities Kourtney Kardashian and Scott Disick are seen on May 31, 2014 in New York City. (Photo by NCP/Star Max/GC Images)
PARIS, FRANCE - MAY 22: Kourtney Kardashian and Scott Disick arrive at the 'Baby Dior' store on May 22, 2014 in Paris, France. (Photo by Marc Piasecki/GC Images)
MIAMI BEACH, FL - MARCH 12: Kourtney Kardashian and Scott Disick are sighted arriving back to their hotel in South Beach on March 12, 2014 in Miami Beach, Florida. (Photo by Dave Lee/GC Images)
LOS ANGELES, CA - MARCH 11: Kourtney Kardashian and Scott Disick are seen at LAX airport on March 11, 2014 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
WEST HOLLYWOOD, CA - OCTOBER 23: Kourtney Kardashian and photographer Brian Bowen Smith attend the Brian Bowen Smith WILDLIFE show hosted by Casamigos Tequila at De Re Gallery on October 23, 2014 in West Hollywood, California. (Photo by Rochelle Brodin/Getty Images)
JERSEY CITY, NJ - JULY 07: Kim, Kourtney and Khloé Kardashian joined Babies'R'Us to surprise military moms-to-be with gifts, including items from their Kardashian Kids collection, at an Operation Shower event at Battello on July 7, 2014 in Jersey City, New Jersey. (Photo by Kevin Mazur/Getty Images for Babies'R'Us)
WEST HOLLYWOOD, CA - MARCH 02: (L-R) Kim Kardashian, Sir Elton John and Kourtney Kardashian attend the 22nd Annual Elton John AIDS Foundation Academy Awards Viewing Party at The City of West Hollywood Park on March 2, 2014 in West Hollywood, California. (Photo by Jamie McCarthy/Getty Images for EJAF)
Scott Disick and Kourtney Kardashian attend the "Party Under The Stars" benefit hosted by Women's Health and Feed at the Bridgehampton Tennis and Surf Club on Saturday, Aug. 9, 2014 in New York. (Photo by Scott Roth/Invision/AP)
Scott Disick and Kourtney Kardashian attend the "Party Under The Stars" benefit hosted by Women's Health and Feed at the Bridgehampton Tennis and Surf Club on Saturday, Aug. 9, 2014 in New York. (Photo by Scott Roth/Invision/AP)
New York, U.S. April 22, 2013. April 22, 2013 - New York, New York, U.S. - Reality personalities SCOTT DISICK and KOURTNEY KARDASHIAN attend the 2013 E! Upfront held at the Manhattan Center. (Credit Image: © Nancy Kaszerman/ZUMAPRESS.com/Alamy Live News)
Television personality Kourtney Kardashian and boyfriend Scott Disick attend the 2nd Annual DirecTV Celebrity Beach Bowl presented by Spike, Thursday, Jan. 31, 2008 in Scottsdale, Ariz. (AP Photo/Evan Agostini)
New York, U.S. April 22, 2013. April 22, 2013 - New York, New York, U.S. - Reality personalities SCOTT DISICK and KOURTNEY KARDASHIAN attend the 2013 E! Upfront held at the Manhattan Center. (Credit Image: © Nancy Kaszerman/ZUMAPRESS.com/Alamy Live News)
Sep. 02, 2010 - Los Angeles, California, U.S. - SCOTT DISICK, KOURTNEY KARDASHIAN Attending The Taste Of Beverly Hills Celebration Held At The Beverly Hilton Hotel In Beverly Hills, California On September 2, 2010. 2010.K66248LONG(Credit Image: © D. Long/Globe Photos/ZUMApress.com)
Sep. 02, 2010 - Los Angeles, California, U.S. - SCOTT DISICK, KOURTNEY KARDASHIAN Attending The Taste Of Beverly Hills Celebration Held At The Beverly Hilton Hotel In Beverly Hills, California On September 2, 2010. 2010.K66248LONG(Credit Image: © D. Long/Globe Photos/ZUMApress.com)
Kourtney Kardashian attends the "Party Under The Stars" benefit hosted by Women's Health and Feed at the Bridgehampton Tennis and Surf Club on Saturday, Aug. 9, 2014 in New York. (Photo by Scott Roth/Invision/AP)
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WATCH: Caitlyn Jenner Rocks a Racy Jumpsuit

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

Just a chill sister Saturday.

A photo posted by Kourtney Kardashian (@kourtneykardash) on

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.

Happy bday to the dopest girl ever!

A photo posted by Tyga / T-Raww (@kinggoldchains) on

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

Happy Birthday to Kylie!

12 PHOTOS
Inside Kylie Jenner's 18th Birthday
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Kourtney Kardashian shows off body in ab-baring jumpsuit at Kylie Jenner's 18th birthday
LOS ANGELES, CA - AUGUST 09: Kris Jenner and Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Tyga and Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Tyga, Kris Jenner, Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Tyga and Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Tyga and Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Tyga and Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Tyga's gift for Kylie Jenner is seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Tyga and Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Kylie Jenner is seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Kris Jenner and Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 09: Kris Jenner, Tyga and Kylie Jenner are seen on August 09, 2015 in Los Angeles, California. (Photo by Keith Johnson/Bauer-Griffin/GC Images)
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Check out the video below to see more on her birthday plans.

Kylie Jenner's Lavish 18th Birthday, Tyga Gifts Her with a $320K Ferrari
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