The 62-year-old momager appeared tipsy as she thanked her eldest daughter, who turned 39 on Wednesday (18.04.18), for teaching her how to be a great mother, before they celebrated among family and friends including her sister Kim Kardashian West and half sister Kendall Jenner and pals Malika Haqq and Larsa Pippen.
Grasping a drink and smoking a roll-up cigarette in Kourtney's Instagram Story, Kris said: ''You taught me how to be a mom, you taught me how to love.
You taught me what being a mom was all about and you were there first.
''I love you more than I can say.
I love you more than life itself, you don't even understand how much I love and adore you and I appreciate you.
''You were the biggest blessing in my life and I thank you Kourtney. And let's all celebrate Kourtney's birthday.''
The whole group had their faces turned into Piñatas and they spent the night sleeping on an airstream inflatable bed in a silver truck that had been turned into a luxury mobile home.
The party came Kourtney enjoyed an ice cream birthday celebration on her actual birthday with her three children, Mason, eight, Penelope, five, and three-year-old Reign - who she has with ex-partner Scott Disick - at Taverna Tony in Malibu, California.
The feast was documented on Instagram Story, with Penelope carrying out a huge platter of ice cream as the group sang 'Happy Birthday' to Kourtney.
Once they returned home, Kourtney was delighted by a rose gold balloon display that read ''Happy Birthday, Mom''.
And on Tuesday (17.04.18), the 'Keeping Up with the Kardashians' star marked the occasion a day before with her sisters Kim, Kendall and Khloe, while visiting the 'Revenge Body' star and her new baby daughter True in Cleveland.
She shared a photo of a pink cake decorated with roses and berries, the words 'Happy birthday Kourtney', and two gold candles on her Instagram Story and wrote: ''It's my birthday tomorrow!! Thank you @khloekardashian (sic)''
And that wasn't the only sweet treat Kourtney received as she also shared a photo of some colourful mini donuts which spelled out 'Happy Birthday Kourtney'.
The excited star also posted a photo of herself and half-sister Kylie Jenner hugging and laughing at Coachella over the weekend and wrote: ''It's my birthday tomorrow.''
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