The pregnant Keeping Up With The Kardashians star donned a very coordinated olive green outfit of ruffled skirt, blazer and boots to attend the bash on Thursday night (10 September).
Sorry, Kim, it may be designer but it's not one of our favourite looks...
It seems her over-the-knee peep-toe boots fell down at one stage as well, as she stopped to hoist them back up. We have ALL been there though, right?
What we did love, however, was her always-flawless make-up and glossy hair. And soon we'll get all the secrets as to how she achieves that: she's filming a series of make-up masterclasses with her BFF make-up maestro Mario Dedivanovic for her brand new website which launches soon.
Kim, 34, and husband Kanye West, 38, left their two-year-old daughter North West at home to attend Rihanna's party in New York to mark the start of Fashion Week.
Their second child, a baby boy, is due in December.
All you need to know about Kim Kardashian:
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