The mum-of-two revealed her curves in a bright yellow swimsuit as she lay back on a sun lounger beside the pool at the Setai Hotel, almost a year to the day that she gave birth to her little girl Penelope.
Joined by long-term boyfriend Scott Disick and their two children Mason, three, and Penelope, one, Kourtney worked on topping up her golden sun tan.
The sweet holiday snaps show the 34-year-old, wearing a strapless one-piece swimsuit, shades and her hair scraped back into a low bun, take a swim with her young daughter, who is wearing a cute ruffled swimsuit.
The two enjoyed some girly time together in the sun while three-year-old Mason, sporting red swimsuit trunks, was also having a blast - jumping into the water and splashing around as his parents looked on.
Mum and dad also enjoyed time together. New aunt to North West, Kourtney wrote: "Poolside with my dude" alongside a photo of the loved-up couple lying side-by-side on a sun lounger.
Family man Scott was also spotted giving Penelope, who celebrated her first birthday on 9 July, a kiss on the cheek.
To mark the landmark birthday, the Kardashians celebrated with an extravagant party at Kris Jenner's LA home with a country fair-themed bash, complete with giant-sized pink and white balloons, piglets and a horse dressed as a unicorn.
The lush green outdoors of Kris's home was transformed into a fantastical setting for the summer garden party, which was attended by around 150 friends and family.
Among the guests at the birthday bash was Penelope's new little cousin North, along with mum Kim and dad Kanye West, according to Us Weekly.