Coy in sunglasses and a tee, Disick was pictured leaning in for a peck with the seated brunette beauty.
After jetting out of Los Angeles together, Disick and Thorne, 19, were spotted getting close and cuddly as they lounged in swimwear on sun beds at a luxury private villa.
The source added, “She also thinks Bella is a little trashy so the idea of the two of them dating definitely bothers her a bit.”
But, it seems, Scott wasn’t content with just the teenage former Disney star. After Thorne left Cannes, he was spotted with two other young women over the next two days – stylist Chloe Bartoli and blogger Maggie Petrova.
Kardashian — who split with Disick in 2015 — was also out and about in the French Riviera. She said her goodbye on Saturday after a busy week spending time with model Younes Bendjima — including tanning and water sports.
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The 38-year-old captioned her Instagram photo, which showed her perched on a boat gazing at her phone, “au revoir,” which is French for “goodbye.”
“Kourtney is having fun and he makes her happy,” the source said. “After all the drama with Scott, Younes is a great distraction. Scott is an absolute mess. Kourtney is aware, but seems less bothered by it.”