Stories on Saturday night to share a video of herself dancing to the music.
The TV personality showed off her fit figure in a black two-piece set, as she sang the lyrics to one of Usher's most famous songs.
Kim danced just rows in front of the singer, and her sister Khloe came up behind to share in the fun.
The blonde grabbed her older sister and swayed her hips as they grinded to the music.
The pair cheered as the song ended and smiled, showing off their full glam makeup and long wavy hair.
Kourtney was nowhere to be found on the wild night out, amid ongoing speculation of a massive family feud.
SISTER FIGHT Earlier this week, a bombshell trailer for The Kardashians season three was released.
In April 2022, Kourtney and her husband Travis Barker , 47, held their Italy wedding in Portofino.
In new footage from the event, the mom of three angrily accused Kim, 42, of using her wedding as a "business opportunity."
Kim asked sibling Kendall Jenner, 27: "She's mad at me?"
In a confessional, Khloe Kardashian, 38, claimed Kourtney was "livid."
While speaking to her other sister Kylie Jenner, 25, Kendall added: "She felt like her wedding vibes were, like, stripped from her,"
Kim though defended herself: "I'm really confused about how this narrative came into her head.
"I couldn't have been more mindful."
The TV star continued explaining: "I said: 'Don't do anything that Kourtney wore to her wedding."
Kourtney's sister is referring to her collaboration with Dolce & Gabbana. who famously sponsored Kourtney and Travis' wedding.
Months later, Kim worked with the Italian fashion house to create her own collection.
After hearing Kim's explanation, Kendall reluctantly admitted: "I see both sides," as Kylie agreed.
Kourtney blasted Kim and said: "People think it's a misunderstanding. It's not.
"It's who she is to her core."
FAN CONTROVERSY In an online thread , fans appear divided as they have taken sides between the Lemme founder and the Skims founder.
One member of Team Kourtney said: "Kim, it's her damn wedding! You have to wear whatever she wants you to wear and shut your mouth. That's the bare minimum."
A member of Team Kim stated: "Kim, in the past, had issues with her family stealing, as she said, 'concepts' for Christmas and other events."
A neutral commentator argued: "I think the sub is making assumptions too soon and allowing that to form judgments against either Kim or Kourt.
"I prefer to reserve my judgment until we actually know what happened. Especially because trailers can be highly deceiving."
The third season of The Kardashians premieres on the streaming platform on May 25.
Kourtney accused Kim of using her wedding as a 'business opportunity' Credit: HULU Kim denied her sister's claims Credit: Hulu