Sofia Richie has been ''great'' for Scott Disick.

The 19-year-old model has been a great influence on the 'Keeping Up With The Kardashians' star after his wild summer and she has made a ''big impact'' on his life.

A source told People magazine: ''She's been great for him. She's made a big impact on his life and hasn't partied at all since they met. They've been travelling together to Mexico, New York and Venice and just hanging out. His friends adore her and nobody notices the age difference. She is very mature, she grew up in Hollywood and has always been in older situations. They seem really happy.''

Meanwhile, Sofia previously revealed Lionel is ''very supportive'' of her relationship with Scott.

Sofia said: ''He's good. He's been very nice. He's been very cool. He's very supportive, whatever that means.''

Sofia's comments come after Lionel, 68, previously expressed is concern at the 15 year age gap between his daughter and the 'Keeping Up with the Kardashians' star.

He said: ''Have I been in shock?! I'm the dad, come on. I'm scared to death, are you kidding me?''

And the music legend is also said to be concerned that Scott's ''playboy ways'' could pose heartbreak for his daughter in the future.

A source said previously: ''He thinks Scott is the worst person she could ever see and that he raised her better than that. 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.''