“LA face with an Oakland booty” the Kardashian wrote alongside a mirrored split of herself (with her booty on display in a tight, black dress) and Harden, 25, nearby.
Kardashian is seen in the dress, a pair of black boots and a watch as she looks down at her phone.
A source told PEOPLE that the encounter was “really scary” for Kardashian. The source added: “She was totally freaked out.”
“Nobody got followed, nobody got hassled, nobody got harassed, nobody got grabbed on, none of that,” he said.