The 33-year-old reality star and 19-year-old actress were spotted kissing and cuddling by the pool at their rented villa Wednesday after arriving in France this week, according to E! News.
Disick was all smiles as he held Thorne in his arms, and was later photographed gazing into the former Disney Channel star's eyes. He ended up in the pool after playfully throwing Thorne and her sister Dani Thorne in.
"[Scott] pulled Bella to him and she sat on his lap to dry off," a source said. "They were both drenched in their clothes and kissing. They were laughing and having a good time."
"They spent all day laying out and flirting with one another. They kissed several times and at one point Bella laid on top of Scott and ran her hands through his hair," the insider added.
Disick and Thorne were first linked this month following a dinner date in Los Angeles, and were seen flying out of Los Angeles International Airport together Monday.
"There's definitely chemistry, and they both seem to love the attention," a source told People. "It's not like they're hiding."
Disick and Thorne's poolside outing comes just days after Disick's ex-partner Kourtney Kardashian was spotted cozying up to Younes Bendjima in Cannes. Disick and Kardashian, who share three children, split in 2015 after nine years of dating.