Kardashian then slipped into a red Baywatch-inspired swimsuit for a jet ski ride with Thompson. See the pictures here.
TMZ reported earlier this week that the two were spotted at Bootsy Bellows nightclub in Beverly Hills, California.
A source tells WHO that the two are a "mini-thing."
"They like each other and are hanging out," the source adds.
Thompson is originally from Canada, and helped the Cavaliers secure their first NBA Championship title in 52 years in an epic Game 7 victory in June.
Kardashian has been linked to several NBA stars in the past. Despite calling off her divorce from former LA Lakers player Lamar Odom, 35, the reality star has said she is not getting back together with the former athlete. Last October, she opened up to WHO about her former romance with Houston Rockets player James Harden.
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