The 42-year-old was seen dancing on Barker’s lap in the background of an Instagram video as his band’s popular song All The Small Things plays in the background.
Kardashian’s raunchy dance moves were posted to the Instagram story of gossip page @girlwithnojob, which is run by comedian Claudia Oshry.
A Reddit user found the clip and posted it to the social media platform, triggering a raft of shocked comments from Kardashian fans and criticisers alike.
“Oh no, why is she dry humping him in public let alone at someone’s wedding?” one outraged person wrote.
“Agree! tasteless, classless, and gives teen hormones vibes,” another said.
One comment read: “This… Is too far so embarrassing for her life and her soul”
The PDA was on full display at the wedding of Simon Huck, a Kardashian friend and PR executive, as he tied the knot with boyfriend Phil Riportella at a luxury Bel-Air ceremony.
Ahead of the event, Kardashian posted a photograph of herself and Barker dressed in wedding attire and captioned the snap: “Going to the chapel.”
Barker, 46, commented on the picture with the reply: “Our turn next”.
The engaged couple have been roasted for their frequent PDA since they started publicly dating in December 2020.
Barker proposed to Kardashian — who shares three kids with ex Scott Disick — in October on the beach in Montecito, California.
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