The pair were spotted skinny-dipping in Hawaii, however they never confirmed the nature of their relationship.
The 23-year-old model and reality star shared a scintillating snap on , in which she was seen wearing just a bikini, boots and a big winter hat, while holding a steaming hot beverage.
Swimwear designer Sahara became a household name overnight after she shared a topless photo with Justin Bieber in 2016.
The post comes after Kendall shared a very similar photo on December 29 while holidaying in Aspen, Colorado.
The blonde beauty is the daughter of famed Australian surfer Tony Ray.