Kim Kardashian says Kanye West is the love of her life.

The 32-year-old reality TV star, who is set to give birth to her first child with the rapper early next month, publicly declared her love for her boyfriend of more than one year, as she wished him a happy 36th birthday on Saturday (08.06.13).

The 'Keeping Up with the Kardashians' star posted a heartfelt message on Twitter, writing: ''Happy Birthday to my best friend, 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 have revealed that he warned her not to buy him anything lavish this year.

An insider told ''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.''

The couple have postponed the rapper's birthday celebrations until later this week as she is no longer able to fly at this stage of her pregnancy and he is currently in New York, where he will perform at the Governor's Ball on Sunday (09.06.13).