09/16/2013 AT 9:30 AM ET
They got it from their momma!
In the snapshot, Jenner, 57, is wearing a blue triangle-top bikini and statement necklace as she stands in the clear waters of a pool.
“Last day of summer gonna miss you,” Jenner wrote.
Jenner isn’t the only one getting social with her svelte figure – Kendall Jenner has also been sharing bikini photos of her own lately. The young model, 17, recently posed for Agua Bendita Colombian swimwear brand.
Meanwhile, older sister Kim Kardashian has opted for a more relaxed look – the mom to North West was photographed stepping out in Beverly Hills in stylish dark, rolled-up pants and a gold-belted, low-cut white top.