AceShowbiz - Kim Kardashian was remembering her late father on her son's latest milestone. After seeing six rainbows on Saint's 6th birthday, the "Keeping Up with the Kardashians" alum thanked her dad Robert Kardashian for his presence.

On Sunday, December 5, the reality TV star took to her Instagram Story to post some pictures of rainbows that she spotted through her home's windows. In the last snap, she exclaimed, "OMG a 6th rainbow for my Saint 6th Birthday!"

"I've never ever had this many rainbows in the same room at once!" the 41-year-old SKIMS founder further gushed. "Thanks dad! I'll tell Saint you said Happy Birthday! #NeededThis."

Hours prior, Kim turned to her Instagram feed to share a tribute to Saint. Posting several photos of the birthday boy, she raved, "My baby Saint is 6 today! There's no one like you and your smile and your negotiating skills."

"I've never met anyone that takes Roblox as serious as you! Thank you for being my bestie with the best snuggles!" the estranged wife of Kanye West added. "You woke up today and promised me that you would snuggle with me until you're 10! lol I love you forever!!!"

Also sharing tribute to Saint was his grandmother Kris Jenner. Alongside images of the kid, Kris penned, "Happy birthday to my little Sainty!!! Saint, you are the sweetest boy who warms my heart and lights up every room with your big delicious smile! You are such a good brother, such a good cousin, such a good son and such a amazing grandson!!"

"You are so kind and so gentle and so loving. I'm so proud of you and I love you more than you can ever imagine. I thank God for you every day and for the blessing of having you as my grandson," the momager continued. "Happy birthday my little angel I love you love you love you."

Saint is Kim and Kanye's second child. The estranged couple is also parents to three other children, 8-year-old daughter North, 3-year-old daughter Chicago, as well as 2-year-old son Psalm.