The Kardashian clan all took to Twitter on Monday to wish Kim a happy 33rd birthday.
Khloé, Kourtney, Kendall and Kylie all posted photo montages of themselves posing with their sister on their respective sites.
Youngest Kardashian sister Khloé said: "Happy birthday KiKi!!!!!! I love you beyond comprehension!!!! You truly are one of my best friends.
"To me you are an angel in disguise. Always there for me in any way! My wish is that I give you as much in life as you have given me! Happy birthday Keeks!!!! KoKo + KiKi".
It was an extra special birthday for the reality star, whose partner Kanye West decided to pop the question.
The rapper hired out the AT&T Park baseball stadium in San Francisco to propose to his girlfriend of a year-and-a-half.