Sofia Richie thinks people should "relax" about her rumored romance with Scott Disick. The 18-year-old model insisted she's "just homies" with the "Keeping Up with the Kardashians," 34, in a tweet Sunday after they were spotted getting flirty on a yacht in Cannes. "Just so everyone can get their panties out of their [expletive], Scott and I are just homies #relax," Richie, the daughter of singer Lionel Richie, wrote. Disick was seen with Richie on a boat Friday, carrying her around the ship and appearing to tickle her at one point, according to TMZ. He was linked to Bella Thorne and ex-girlfriend Chloe Bartoli earlier in the week. "Scott's lifestyle has become out of control," a source told Us Weekly. "His friends are all worried for him and trying to calm him down. His friends begged him not to go to Cannes." Thorne, whom Disick was spotted kissing poolside Wednesday, tweeted the next day that she's "not talking" to the reality star. Her post followed news Disick was seen getting close to Bartoli at his villa Thursday. Sources told People this week that Disick's ex-partner Kourtney Kardashian won't let the star see their three children "unless he shapes up." Disick's flings follow word Kardashian is dating Younes Bendjima. "She used to worry about Scott, but not anymore. She just finds him absolutely pathetic. It's obvious to everyone that he is a mess," an insider said. "She plans on being firm. Get help, or he won't come near the kids."