Kim Kardashian Shares Sweet Message of Gratitude on Her Dad's Birthday: 'Thank You for Everything'

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

Kim Kardashian is remembering her dad on what would have been his 73rd birthday.

The mother of two took to Twitter to share a sweet family photo from her childhood, alongside a touching message thanking the late Robert Kardashian Sr. for "everything."

WATCH: Rob Kardashian Shares Sweet Throwback Pics on Dad Robert Sr.'s Birthday: 'Wish You Were Here to Meet Dream'

"Happy Birthday dad! I love this family photo. I love our family," Kim wrote. "Thank you for EVERYTHING. I'm so grateful you are my dad!"

The 36-year-old reality star also posted that she had found a three-page letter her dad wrote her after high school, and how she hopes to write similar letters for her children, 3-year-old North and 1-year-old Saint West.

RELATED: Rob Kardashian Posts Sweet Throwback Pic With His Dad Ahead of Becoming a Father: 'Can't Wait'

Kourtney Kardashian, meanwhile, took to Instagram to share a throwback pic of herself as a baby -- commenting on her dad's amazing moustache -- while Kris Jenner posted the same family photo as Kim, writing, "There’s not a day that goes by that we don't miss you." 

WATCH: Rob Kardashian Posts Look-Alike Pic of Newborn Daughter Dream and Late Father Robert Kardashian: ‘An Exact Copy’

The Kardashian family also paid tribute to Robert in December, celebrating his life and memory at the Angel Ball in New York City. 

See more in the video below.