The Keeping Up With The Kardashians star, 37, no doubt kept all eyes on her as she attended the opening of Jewel night club at the Aria Resort & Casino on Saturday (21 May).
Kourtney flaunted her figure in an all-leather ensemble, teamed with thigh high black boots and a neck choker. She joked on Instagram she had 'Bat Girl vibes' after adding a long black cape to her outfit while walking from her hotel room to the club.
While Kourtney - who is a mum of three - was partying up a storm until around 4am in Las Vegas, her former partner Scott Disick was pictured over in London with Kourtney's sister Kim Kardashian West and her husband Kanye.
Kim was in London to speak at The Vogue 100 Festival.
Meanwhile, it seems Kourtney is ready to find love again, as sister Kylie Jenner recently signed her up for dating app Bumble, which only allows women to initiate conversations. Kourtney told E! News: "That's what sisters do but it's cool that the women are in charge. It's a great idea."