If you've seen "Keeping Up with the Kardashians" or the Kardashian family's latest reality show, "The Kardashians," you are well aware of the long-standing tension between Kourtney Kardashian Barker, the oldest of Kris Jenner's six children, and Kim Kardashian you are well aware of the long history of tension between Kourtney Kardashian Barker and Kim Kardashian. Kim turned 43 yesterday and is due to give birth to her fourth child soon, and Kourtney, who has her first child with husband Travis Barker, celebrated her sister, who is a year and a half younger, and joked about the long-standing feud.

In her Instagram Story, Courtney wrote in a birthday tribute to Kim, "Happy Happy Birthday to my first sister. Thank you for being your boss all these years and listening to my crazy ideas. Everyone thinks the fights they see on TV are bad, but if only they could have witnessed the hair pulling and nail digging fights we had in high school."[3

Courtney then jokingly added, "The joy of sisterhood," and concluded, "I will always and forever love you deeply. May this year be blessed with love, happiness, and abundant joy."

If you are watching Season 4 of "The Kardashians" on Hulu (which premiered on September 28 and is still airing), the sisters are currently involved in a fight on the show. Interestingly, the two started fighting after watching an edit of season 3 of the show. (In short, they fought and seemed to have moved on, but after watching the first fight on screen, they fought again.) (Reality Star Pitfalls: ......)

Despite the issues currently unfolding between the two on the show, Courtney showed Kim enough love yesterday, from the 1987 Halloween one ("We were twins from the beginning," Courtney wrote of their matching costumes) to the Victoria's Secret Angel when they wore matching white lingerie and wings, to another Halloween when they were both children, when they dressed up as Snow White and a clown, the two shared throwback photos.

Kim celebrated her birthday Friday night at a star-studded party in Beverly Hills.