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(Yahoo!) - It was a happy birthday indeed for Kanye West, who celebrated turning 36 with a star-studded party on Saturday night in New York City. One face that was notably absent from the festivities, however? Oh, just the mother of his unborn child.

That's right, West, who was in town in advance of his performance at the Governors Ball music festival on Sunday, left his (extremely) pregnant girlfriend, Kim Kardashian, at home — back in Los Angeles.

While Kim sent Twitter messages of love and devotion to her man, West partied at the Caribbean-themed hot spot Miss Lily's with Kim's bestie Jonathan Cheban, Scott Disick, Nas, Jay-Z, and Beyoncé (who took the opportunity to further combat pregnancy rumors by sporting a sexy midriff-baring top that flashed her flat, toned abs).

As the A-list crew (presumably) ate, drank, and enjoyed being merry, Kim tweeted:

For added emphasis, she included a very crafty photo collage of some of their most lovey-dovey shots.

As for West, he seemed to keep his soiree relatively low-key. The snaps from the evening show everyone looking relaxed and happy. Well, except for the fact that deep down they must all have been missing Kim … right?

Granted, the brunette beauty is too far along in her pregnancy to be allowed to fly, but then why not have a party in the good ol' City of Angels? Though Kim didn’t seem put off by being excluded, something tells us she would have preferred to spend the night by West's side.

Good thing there's always next year!

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