The 30-year-old reality star flaunted her gym-honed bod – and LOTS of cleavage – in a skintight white frock with a plunging neckline.
Khloe finished her look with sparkling sandals (love them!) and super glossy, super voluminous hair styles in bouncy, loose waves.
The event at Chateau Marmont Hotel in Hollywood was to celebrate the launch of Calvin Klein Jeans' #mycalvins Denim Series, which stars Kendall as the face of the campaign.
Kendall, 19, and Kylie, 17, were both at the glitzy event, along with Scott Disick.
Kim Kardashian West had to give the bash a miss as she's currently over in New York with husband Kanye, while Kourtney Kardashian was at home with her three young kids: Mason, five, Penelope, two, and Reign, five months.