They always stick together, and on Friday (April 18) Khloe Kardashian celebrated her big sister Kourtney's birthday with a photo montage on Instagram.
The multi-pic set, featuring shots of the sisters was captioned “Happy birthday to my twin soul, my spirit animal, my ace, my MILF, my boo, my best friend. I f*cking love you so much. I could never explain how much I adore you…. You have to be around us to understand our bond. @kourtneykardash 35 never looked so good! Thank you for always being YOU."