Looking glam for the lavish bash, the POOSH founder rocked a figure-hugging black leather dress as she posed in front of a large swimming pool adorned with floral love hearts.
With her brunette tresses covering her face, the 41-year-old put on a very leggy display in the thigh-grazing outfit.
The black minidress featured pockets across her chest as well as dramatic cuffed sleeves and a waist-cinching belt.
With the garment just about covering her famous rear, Kourtney added height to her outfit thanks to a pair of towering see-through stilettos.
Clutching onto a small black handbag, she made sure the dress was the centre of attention in the sultry snap.
Posing with her legs apart and averting people's eyes to her toned pins, she turned her head to the side as the party continued behind her.
Underneath the post, she wrote: "L ove grows here."
The Kardashian/Jenner clan came together for Khloe's birthday including a rare appearance from younger brother, Rob Kardashian.
Khloe threw the small, intimate bash as her LA abode which featured a white and baby pink colour scheme with balloons and massive signs hanging in the back garden.
Making sure everyone was staying safe at her lockdown party, the mum-of-one gave people facial masks along with bottles of hand sanitiser with her face emblazoned across the front.
Posing against a selection of balloons, the mum-of-one looked incredible in a body-con sparkly dress with nude heels.
Debuting her newly dyed brunette dresses, and glam look, Khloe made sure all eyes were on her during her special day.