The reality stars held court at Elton John's AIDS Foundation Academy Awards Viewing Party hosted by Patron spirits in West Hollywood Park, along with Heidi Klum, Neil Patrick Harris, Lady Gaga and Donatella Versace.
The Kardashian ladies all wore shades of red and black, but Kim's rouge gown stood out for its bright hue and plunging neckline.
"I wanted something red," she told PEOPLE of her fashion choice. "I was in a red mood."
While Khloé and Kourtney, who sipped champagne, chatted and took photos with a friend, Kim and mom Kris Jenner were more social. Kris, drinking white wine, joined Kim in conversations with two couples. Later, Kim gamely posed for photos with fans. Dancing with the Stars pro Cheryl Burke stopped by their table to chat with the reality TV stars, who left the bash before 7 p.m.
Pop princess Britney Spears took a break from her successful Vegas show to attend, stopping by the party for about 10 minutes. Wearing a sparkly black dress with an American Hustle-esque neckline and her new dark auburn tresses, Spears took a photo with host John before heading out.
– Melody Chiu & Michele Corriston