They're known to share clothes and take fashion inspiration from one another.
And it seems as if Kim Kardashian, 40, took a page out of her model half-sister Kendall Jenner's book when it came to landing on the perfect summer bikini.
On Friday the SKIMS founder was seen modeling a skimpy purple bikini from I.AM.GIA, which Kendall, 25, had actually worn in a different shade back in April.
Twinning! Kim Kardashian (left) slips into the SAME bikini donned my model half-sister Kendall Jenner (right in April) in latest Instagram snaps
Kim opted to flaunt her curves in a purple version of the high rise bikini in several Friday posts from mom Kris Jenner's Palm Springs abode.
And months ago at the same residence, Kendall had accessorized the nude version of the itty bitty swimsuit with a pair of cowboy boots.
In Kim's trio of photos she worked her angles. In one snap she threw two peace signs up while posing straight on, and in another she tugged at her ponytail and crossed her toned legs.
Bikini babe! Kim opted to flaunt her curves in a purple version of the high rise bikini in several Friday posts
Perfect for tanning! The itty bitty bikini made by I.AM.GIA was the perfect ensemble for a very hot pool day
'Good Morning (sun emoji) Palm Springs (palm tree emoji),' Kim captioned the photos.
In Kendall's photos she sat perched on her mom's luxe outdoor patio furniture and tugged at the bikini before reclining back with soaking wet tresses.
Despite boasting incredibly different figures,
