Amelia Hamlin, Scott Disick.Photo: Amelia Hamlin/InstagramScott DisickandAmelia Hamlin’s relationship is heating up.The 37-year-oldKeeping Up with the Kardashiansstar “is getting serious” with the 19-year-old model, a source tells PEOPLE.“He’s been telling friends how much she means to him and how into her he is,” says the source.As for their 18-year age gap? The source says the couple doesn’t “feel” the decades between them.“She grew up in the industry and knows how all this works,” the source adds about Hamlin — the youngest daughter of actor Harry Hamlin andReal Housewives of Beverly HillsstarLisa Rinna, who themselves share a12-year age gap. “It’s a different type of maturity, and they really don’t feel the age difference.““They’ve been inseparable and have been going back and forth between Miami and L.A.,” according to the source.Scott Disick and Amelia Hamlin.Joe Scarnici/Getty; Jean Baptiste Lacroix/GettyThe pair have been spotted together several times since October, when theywalked arm-in-arm on the beachin Santa Barbara and were also seen leavingKendall Jenner’s controversial Halloween partytogether. Two months later, theytoured several spectacular homeslisted for sale in Los Angeles.In February, the duo made their relationshipInstagram officialin honor of Valentine’s Day.Disick shared a photo of the two at dinner, captioning the shot, “Why so serious.” In a second snap, which he captioned “Just kiddin,” the couple laughed at the camera as Disick rested his arm on Hamlin’s chair.Amelia Hamlin and Scott Disick.Amelia Hamlin/InstagramMost recently,Hamlin gushed about her reality star boyfriendwhen she posted two photos of them on herInstagram Storyon Feb. 28.“My dream man,” she captioned a shot of the two sitting at a table together. In another, Hamlin gave Disick an adoring look as he wrapped his arm around her waist.

Amelia Hamlin, Scott Disick.Photo: Amelia Hamlin/Instagram

Amelia Hamlin, Scott Disick

Scott DisickandAmelia Hamlin’s relationship is heating up.The 37-year-oldKeeping Up with the Kardashiansstar “is getting serious” with the 19-year-old model, a source tells PEOPLE.“He’s been telling friends how much she means to him and how into her he is,” says the source.As for their 18-year age gap? The source says the couple doesn’t “feel” the decades between them.“She grew up in the industry and knows how all this works,” the source adds about Hamlin — the youngest daughter of actor Harry Hamlin andReal Housewives of Beverly HillsstarLisa Rinna, who themselves share a12-year age gap. “It’s a different type of maturity, and they really don’t feel the age difference.““They’ve been inseparable and have been going back and forth between Miami and L.A.,” according to the source.Scott Disick and Amelia Hamlin.Joe Scarnici/Getty; Jean Baptiste Lacroix/GettyThe pair have been spotted together several times since October, when theywalked arm-in-arm on the beachin Santa Barbara and were also seen leavingKendall Jenner’s controversial Halloween partytogether. Two months later, theytoured several spectacular homeslisted for sale in Los Angeles.In February, the duo made their relationshipInstagram officialin honor of Valentine’s Day.Disick shared a photo of the two at dinner, captioning the shot, “Why so serious.” In a second snap, which he captioned “Just kiddin,” the couple laughed at the camera as Disick rested his arm on Hamlin’s chair.Amelia Hamlin and Scott Disick.Amelia Hamlin/InstagramMost recently,Hamlin gushed about her reality star boyfriendwhen she posted two photos of them on herInstagram Storyon Feb. 28.“My dream man,” she captioned a shot of the two sitting at a table together. In another, Hamlin gave Disick an adoring look as he wrapped his arm around her waist.

Scott DisickandAmelia Hamlin’s relationship is heating up.

The 37-year-oldKeeping Up with the Kardashiansstar “is getting serious” with the 19-year-old model, a source tells PEOPLE.

“He’s been telling friends how much she means to him and how into her he is,” says the source.

As for their 18-year age gap? The source says the couple doesn’t “feel” the decades between them.

“She grew up in the industry and knows how all this works,” the source adds about Hamlin — the youngest daughter of actor Harry Hamlin andReal Housewives of Beverly HillsstarLisa Rinna, who themselves share a12-year age gap. “It’s a different type of maturity, and they really don’t feel the age difference.”

“They’ve been inseparable and have been going back and forth between Miami and L.A.,” according to the source.

Scott Disick and Amelia Hamlin.Joe Scarnici/Getty; Jean Baptiste Lacroix/Getty

Scott Disick, Amelia Hamlin

The pair have been spotted together several times since October, when theywalked arm-in-arm on the beachin Santa Barbara and were also seen leavingKendall Jenner’s controversial Halloween partytogether. Two months later, theytoured several spectacular homeslisted for sale in Los Angeles.

In February, the duo made their relationshipInstagram officialin honor of Valentine’s Day.

Disick shared a photo of the two at dinner, captioning the shot, “Why so serious.” In a second snap, which he captioned “Just kiddin,” the couple laughed at the camera as Disick rested his arm on Hamlin’s chair.

Amelia Hamlin and Scott Disick.Amelia Hamlin/Instagram

Amelia Hamlin, Scott Disick

Most recently,Hamlin gushed about her reality star boyfriendwhen she posted two photos of them on herInstagram Storyon Feb. 28.

“My dream man,” she captioned a shot of the two sitting at a table together. In another, Hamlin gave Disick an adoring look as he wrapped his arm around her waist.

source: people.com