E! reality star Kim Kardashian marked her sister Khloe's 30th birthday in style on Friday, by sharing a sweet picture of the pair as children on Instagram.

The 33-year-old accompanied the picture with the caption: "KoKo!!! My baby sister!!! Happy 30th Birthday! I love you so much! I love seeing you so happy! You are the strongest person I know (literally & figuratively) !!!! LOL [sic]."

Khloe Kardashian will continue her birthday celebrations at a ticket-only party at Tao in Las Vegas on July 4.