But don't worry, thanks to Instagram, Khloe was able to give Kourt a special b-day shoutout that the whole world was able to see - and in true Khloe fashion, the reality star kept it super real.
"Happy birthday to one of the most monotone chicks I've ever met," Khloe captioned the collage above. "It's one of my favorite things about you! Bible!"
How's that for being blunt? LOL!
Then Khloe got serious and shared a really sweet message for her sister. "Every single day I become more and more thankful for how many permanent God given best friends I have in my life," she wrote. "Kourt you are the yin to my yang, the Siegfried to my Roy, the Lucy to my Ricky, The Thelma to my Louise, the Wayne to my Garth, the Posh to my David, the sugar to my spice, the icing to my cake."
"I cannot express how much I love you, respect you, admire you... You inspire me every day. I couldn't ask for a better big (little) sister," she continued. "My life would be meaningless without ALL of you. So with every single birthday I am more and more appreciative that we get to spend another year together only strengthening our bond as soulmates every single one of us."
Aw...That definitely makes up for the monotone comment!