The supermodel wore a blue thong bikini as she lazed around a swimming pool with the basketball star.
Kendall, 22, and 21-year-old Ben are believed to have been dating for a couple of months.
The pair have never confirmed their relationship publicly but Ben has been seen with Kendall and her family on a number of locations.
As Kendall lay back and relaxed in the sunshine, Ben dived into the pool to cool off.
The pair flew out to Mexico with half sister Khloe and her boyfriend Tristan Thompson following Kylie Jenner's 21st birthday bash in Los Angeles.
Earlier this month it was reported Kendall and Ben had moved in together.
The couple were claimed to have rented an incredible Los Angeles mansion for £19,000 a month.
Ben has met Kendall’s family and was spotted cosying up to her last month during her sister Khloe’s Fourth of July party.
They were first spotted together at the Waldorf Astoria Hotel in Beverly Hills in June.
An insider told Page Six that Kendall and Ben had enjoyed a lunchtime date at the Beverly Hills Hotel this week and they were seen in New York last week with a group of friends.
An eyewitness said: “Security measures seemed to have been taken to ensure Kendall and Ben enjoyed their night hassle free.
“They were smiling the night away with their friends.”
Before dating Ben, Kendall was linked to another NBA player Blake Griffin.
The exes avoided an awkward run-in at Coachella earlier this year by making sure they stayed well away from each other.
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