Although Kourtney Kardashian is rumored to be pregnant, the "Keeping Up with the Kardashians" star put all of the baby speculations to rest when she posted a picture of her drinking alcohol on Instagram.

The 34-year old reality star, who already has two children with boyfriend Scott Disick, has been reportedly trying to hide her third baby bump. But over Labor Day Weekend, the fashion designer wore a tight low-cut body suit and sipped champagne letting the world know that the only thing she was expecting was a good night at the club.

On Saturday, Kardashian was in Las Vegas where she hosted a 2013 Labor Day Weekend bash at Hyde Bellagio. The star wore a tight sexy lace jumpsuit that showed off her flat stomach and exposed her chest with its plunging neckline.

Kim Kardashian's older sister arrived at the club with a couple of girlfriends, including younger sister Khloe's best friend Malika Haqq. Kourtney posed for photos and signed autographs for fans, according to the Las Vegas Sun.

[For photos of Kourtney Kardashian showing off her flat stomach at Hyde click HERE]

Once inside the star and her friends made their way to a VIP booth beneath the DJ booth where a parade of sparklers and signs spelling out K-O-U-R-T-N-E-Y.

The star posted the photo of herself holding tight to a champagne glass with the caption, "Up in tha club! @hydebellagio."

Although she has yet to release a statement confirming or denying her third pregnancy from the amount of alcohol flowing and her wild pictures we imagine that the eldest Kardashian sibling is not pregnant.

Do you believe that Kourtney Kardashian is not pregnant or do you think she is trying to cover up her third pregnancy? Leave us a comment below.