Happy Birthday to my best friend, the ❤of my life, my soul!!!! I love you beyond words! instagram.com/p/aTgfI-OS-a/— Kim Kardashian (@KimKardashian) June 8, 2013
With the tweet, she Instagrammed a photo collage of "Kimye" in love. Kardashian and West are expecting a baby girl in July.
Because of the pregnancy, Kardashian's doctor has advised her not to fly, so she had to miss the fete. She tweeted earlier this year that she wouldn't be able to fly after her May trip to Paris.
The party was at Ms. Lily's in New York City. At the party, Beyonce arrived wearing a midriff-baring top that quieted some of her own pregnancy rumors. She paired the striped body-con ensemble with orange heels and black sunglasses.
Other guests included West's rapper friend Nas, Kourtney Kardashian with boyfriend Scott Disick, and Kim's good friend Jonathan Cheban.