The two were spotted holding hands throughout the evening, and at one point, Richie swapped her long beige trench coat for Disick’s grey, fur-lined bomber.
Disick, 34, and Richie, 19, first sparked speculation in May after they were pictured cuddling up aboard a yacht in the south of France during the Cannes Film Festival. At the time, Richie — who previously dated Justin Bieber — adamantly denied anything romantic was going on, tweeting that the two were “just homies.”
RELATED VIDEO: Scott Disick and Sofia Richie Get a Congratulations Dessert and Become Instagram-Official
“He thinks Scott is the worst person she could ever see and that he raised her better than that,” said the source of the American Idol judge’s reaction. “He thinks she should have more respect for herself as a young woman. Lionel knows Scott’s playboy ways, and he doesn’t want to see his daughter get hurt.”
The insider also said Sofia is “much more invested in the relationship” than Disick, who shares three kids with his ex Kourtney Kardashian, 38.
“Sofia wanted commitment from him, so he committed to be her ‘boyfriend,’ ” the source said. “Sofia feels like she’s in the in-crowd right now and loves that Scott has swagger and money and that he loves to travel and party.”