The mother-of-one was bold and blooming in her acid green bandeau two-piece, which featured a braided strap.
Kourtney Kardashian pulled her long brunette locks up in a bun to reveal a glowing complexion and wore a pair of aviator shades.
The doting mother watched on as her two-year-old son Mason cooled off in front of a water sprinkler on the grass.
The reality star and her son were also joined by Kourtney Kardashian’s partner Scott Disick, who enjoyed a stroll with his wife and son on the beach.
After getting his tiny feet sandy, Mason washed off his own footsies under the watchful eye of his father and then helped his pregnant mother tend to hers.
Earlier in the day, Kourtney Kardashian took Mason into the surf and instructed him how to splash around in the waves.
Giggling with glee, Mason ran ahead of his mother and even at seven months pregnant she jogged behind him to catch up.
Kourtney Kardashian watched on with pride as Mason took a fake ride all by himself on a jetski that was parked in the sand.
Scott Disick even showed him how to put his little hands on the wheel of the jetski and how to make it go.
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