Kim Kardashian West and Kris Jenner. Picture: Instagram

Kim Kardashian West is the "best mom, wife, sister, daughter and friend", according to Kris Jenner.

The showbiz matriarch took to her Instagram account on Sunday to write a kind message about Kim, who was celebrating her 38th birthday.

Alongside a collage of photos of them together, Kris wrote: "Happy birthday @kimkardashian!!! My beautiful girl, I love and adore you and wish for you the most amazing day and year...you have brought all of us such love, joy, and happiness. 

You are the best mom, wife, sister, daughter and friend and i am beyond blessed to be your Mom. I cherish every single memory we share and wish for you all the love you give us every single day...i love you. Mommy. (sic)"

Meanwhile, Khloe Kardashian also wrote a similarly heartfelt message about the reality TV star, describing Kim as a "super woman".

Khloe wrote on Instagram: "Happy birthday sweet Kimberly!!! My entire life, you've always been someone that I look up to. To me, You are super woman!! I'm not sure how you do it all and make everything look so easy. People have no idea how selfless of a human being you are. With no credit wanted either. (sic)"

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Happy birthday sweet Kimberly!!! My entire life, you’ve always been someone that I look up to. To me, You are super woman!! I’m not sure how you do it all and make everything look so easy. People have no idea how selfless of a human being you are. With no credit wanted either. I am so impressed by the woman, wife and mother you have become. I’m so thankful for us getting closer over the last year. You’re a fucking rider! Without you I would be lost! Crazy shit happens to us all of the time, but how fucking lucky are we that we get to experience this crazy thing called life with one another? I know for certain, that no matter what happens to any of us, we will always be OK because we have one another. I hope you have the happiest of birthdays Keeks! I pray that every wish you have, it comes true. You are so deserving! I love you!! Until the end of time, I love you!!!

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The 34-year-old beauty also thanked Kim for helping her to survive the last 12 months of her own life, which has included the arrival of her six-month-old daughter True and rumours of her splitting from Tristan Thompson.

She said: "I'm so thankful for us getting closer over the last year. You're a f***ing rider! Without you I would be lost! Crazy s**t happens to us all of the time, but how f***ing lucky are we that we get to experience this crazy thing called life with one another? I know for certain, that no matter what happens to any of us, we will always be OK because we have one another. (sic)"