They divorced last year after 22-years of marriage, ahead of 65-year-old Caitlyn's transition into life as a woman.
Following the announcement, it was rumoured Kris and Caitlyn, formerly known as Bruce, were feuding behind the scenes.
But they put all of that behind them and came together this week to celebrate their youngest daughter Kylie's 18th birthday.
Unsurprisingly Kim Kardashian documented the day's events with a number of selfies – including one with her mother and former stepfather.
She wrote: "The parent trap."
Kim also shared a gorgeous snap with sisters Kylie, Kendall, 19, Khloe, 31, and 36-year-old Kourtney.
Following Caitlyn's sensational Vanity Fair debut, momager Kris praised her ex for her bravery.
She said: "I think it's amazing. I think that someone following their dream is truly inspirational to a lot of people… you have to do what makes you happy."
In the same Vanity Fair interview, Kris claimed she had no idea about Caitlyn's true identity.
She said: "Why would you want to be married and have kids if this is what you wanted since you were a little boy? Why would you not explain this all to