The pregnant reality star dared to bare and revealed her ample cleavage in a sparkling black gown that had a plunging neckline and a thigh high split showing off her legs.
The 32-year-old is said to be just three-months along but already has a good size baby bump which protruded beneath the revealing dress.
Nothing Mumsy Here: Kourtney Kardashian dared to bare in a cleavage baring dress for New Year's Eve bash with Scott Disick
Tasty: The pair stopped in at the Sugar Factory American Brasserie at the Paris Las Vegas where Scott fed his lady love
Her boyfriend Scott Disick has been bemoaning the fact that he doesn't get to be passionate with her anymore in the new season of Kourtney & Kim Take New York.
But judging by the photos of them making out on New Year's Eve, it appears the fireworks are back on in their relationship.
Kissing Kardashian: Kourtney and boyfriend of four years enjoy a heavy make out session as they saw in the new year
Revealing: The couple hosted the night at Chateau Nightclub in Sin City where Kourtney put her legs on display
Out with the old: The pair seem to be back on track with their relationship which was rocky last yearThe reality star locked lips with her boyfriend of four years at the stroke of midnight at their Sin City event and was unabashed in their display of affection.
Meanwhile Scott looked dapper as always and wore a tuxedo, had his hair slicked back but was puffing away on a cigar all night.
Kourtney hosted the night with Scott at Chateau Nightclub & Gardens at the Paris Las Vegas but left their two-year-old son Mason at home.
Kravings: Kourtney is expecting her second child and couldn't resist some sweet treats
Party people: Jersey Shore's Ronnie and Hugh Hefner's ex-girlfriend Holly Madison were also seen at Chateau during the evening
Brothers in arms: Joel and Benji Madden also took a trip for Paris (in Vegas) for New Year's Eve
Keeping a low profile: Nicole Richie was also at the party but did not walk the red carpet
Instead of supping on champagne the mother-to-be stuck to sparkling apple juice.
Earlier in the night, Kourtney visited the Sugar Factory American Brasserie where she was seen in front of a plate full of cupcakes and ice cream which as a pregnant lady it is likely she indulged in a little bit.
Parents night out: The pair made their way through the hotel with Kourtney's baby bump on display
Feeling lucky: The reality stars stopped in the casino for a gamble
In the money: Kourtney tried her luck on the roulette table
Kourtney and Scott arrived in Sin City by private jet which they had shared with sister Kim and mother Kris Jenner.
It is unknown how much Kourtney made for hosting her night but Kim reportedly raked in $600,000 for her appearance at Tao.
Say cheese: Kourtney took some snaps with fans as Scott looked on
Stepping out on his own: Rob Kardashian saw in the new year at his own bash at Tryst Nightclub at Wynn Las Vegas
Stepping into the limelight: Rob hosted his very own party at TRYST