The mother-of-two flaunted her recent weight-loss on the red carpet, showing off her bangin' body in a cleavage-baring strapless black dress. She accessorized her look with strappy black heels and slicked back hair.
Once inside, Kardashian and her girl squad settled in at a VIP table located on the Main Stage near the DJ Booth, where Fergie DJ was seen laying down chart-topping tracks for the enthusiastic crowd. Kim pulled double-duty for the evening as she also helped celebrate a fan's bachelorette party, who was sitting close to the VIP area.
"I'm here celebrating my friend Arianna's bachelorette party tonight," Kim said to the cheering crowd. "I hope you guys have a good time. Let's have some drinks, let's have fun tonight!"
Kim later commemorated the special night with plenty of selfies.
On Sunday, Kim caused quite a stir when she posted videos of a phone call between her husband, Kanye West, and Swift to Snapchat. In the clips, Swift seemingly approves West's song "Famous," which she previously denied doing.
According to a source close to the star, Kardashian has no regrets about the situation. "She doesn't care," the source told ET. "The decision to post the video on Snapchat was decided by Kim last minute. It's not something she premeditated."
"This was a decision that was made by Kim and really not influenced by Kanye at all," the source continued. "She just felt it was time that people saw that Kanye did everything he could do to make sure Taylor had known about this and that she felt comfortable about it, and she essentially gave him approval."