Pregnant Kim Kardashian stuck in Los Angeles while Kanye West celebrates birthday in New York

Kim Kardashian wasn't there to celebrate Kanye West's birthday.

While pals like Beyonce and Jay-Z were on hand at the party in New York City, Kanye's girlfriend of more than one year was noticeably absent - stuck Los Angeles because she is no longer able to travel by plane ahead of the birth of their first child next month.

A source confirmed to Us Weekly: 'Kim isn't allowed to fly'.

Grounded: Expectant mom Kim Kardashian was forced to skip boyfriend Kanye West's birthday bash in New York apparently because she's too far along in her pregnancy

Kanye rang in his 36th year at Caribbean-inspired hotspot Ms Lily's.

More...

Beyoncé cuddles up to husband Jay-Z in intimate picture... as she lays pregnancy rumours to rest by wearing a crop top to Kanye West's birthday party

Other guests at the low-key bash included Nas, Kourtney Kardashian's fiance Scott Disick and Kim's best friend Jonathan Cheban.

Kim was stuck in Los Angeles, her growing belly appearing to be getting bigger by the day, to await the birth of their first child due next month.

Birthday boy: Kim was conspicuously absent as Kanye celebrated turning 36 years old with pals Jay-Z, Nas and others at Ms. Lily's in New York on Saturday

Not jealous we hope: While enormously pregnant Kim was stuck in Los Angeles, Beyonce graced Kanye's party in a sexy midriff-baring number

Looking fabulous: Jay-Z's gorgeous wife Beyonce, who had a baby last year, showed off her tummy that was remarkably toned

But her thoughts were with Kanye as he rubbed elbows with his party pals.
The reality star publicly declared her love for her boyfriend as she wished him happy birthday on Twitter on Saturday.
'Happy Birthday to my best friend, the love of my life, my soul!!!! I love you beyond words!' Kim tweeted.

Low-key evening: Kanye's party guest Jay-Z is a dad too and afterwards headed home with Beyonce to their baby girl Blue Ivy Carter

Overflowing with love: Kim posted a collage of couple pics wishing Kanye a happy birthday, calling him 'the love of my life, my soul!!!! I love you beyond words!'

The brunette beauty also attached a photo collage, featuring several pictures of the couple looking madly in love together.

Kim presented the Mercy hitmaker with a $750,000 Lamborghini for his birthday last year but sources close to Kanye revealed that he warned her not to buy him anything lavish this year.

An insider told HollywoodLife.com: 'He doesn't want Kim to think about trying to do something big for him on his birthday when she's pregnant.

'All he really wants for his birthday is peace of mind for him and Kim.'

Kanye is due to perform at the Governor's Ball in New York on Sunday.