The two appear to be on a shoot, possibly for Burberry as Cara has also posted a racy picture of her bottom in a lacy see-through Burberry skirt.
In other snaps the pair snuggle up together on a bed, and joke around with an old-fashioned diver's suit.
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Cara Delevingne and Suki Waterhouse
In another, Suki takes a selfie of the two of them joking around after a swim, as Cara jokingly attempts to lick Suki’s armpit. She captioned the picture: "pitwash".
The pair have been friends for some time now, and earlier in March stole the show at a swanky dinner celebrating Karl Lagerfeld's fragrance launch in London, where after sitting down, the pair started pulling silly faces as they took photos of each other on a retro camera.
During London Fashion Week in February, the pair led the army of models wearing personalised colour block ponchos at Christopher Bailey's captivating Burberry show finale.
Cara, one of our English fashion icons, has been jetting around the world lately, spending time before Shanghai at the Coachella Music Festival in California with her sister Poppy, and before that with Taylor Swift in New York.
Suki, who has been dating actor Bradley Cooper for over a year, has also recently finished filming her first film.
Speaking about the project, Love, Rosie which also stars Sam Claflin and Lily Collins, Suki said: "It's a love story following high school children into adult life. It was shot in Ireland. It's awesome."
She added: "In Love, Rosie, I'm the one who gets in-between Lily Collins and Sam – a kind of poison dart in the love story.
"It was an incredible experience. (Sam's) absolutely hilarious – so comfortable in himself. The bits with him were the easiest to play, for sure."