Kourtney Kardashian joins ex Scott Disick and his girlfriend Sofia Richie in 'tense dinner'

For the first time in their year-long romance, Scott Disick and his young girlfriend Sofia Richie were seen with his ex Kourtney Kardashian.
The couple has been dating since last September and were seen leaving the Nobu Restaurant in Malibu, California, after dining with Kourtney who was seen leaving in a separate vehicle. Pictures of the trio on Sunday evening were obtained by RadarOnline.
The 35-year-old Scott Disick and 39-year-old Kourtney Kardashian were together for around nine years and share three children together — eight-year-old Mason, three-year-old Reign, and six-year-old Penelope. As reported by PEOPLE, a source shared that Kourtney "doesn’t necessarily care to get to know Sofia better, but she feels she needs to because of the kids."
"Sofia spends time with Kourtney’s kids, so Kourtney wants to make sure they are all on the same page. Scott and Sofia tend to get into arguments. Kourtney wants to make sure the kids are in a positive environment when they are at Scott’s house. She is setting up rules for how things need to be when the kids are with Scott," the source continued.
Another source shared that Kourtney arrived alone while Disick and Richie arrived together. "It was a quick dinner. It seemed a bit tense. It wasn’t like they are all friends and were hanging out for fun. It looked more like a business dinner," the insider shared.
The couple's outing comes just days after Sofia and Disick had traveled together to Australia. Disick recently also accompanied Kardashian on her family vacation to Bali.

When Disick and Sofia started dating, they raised a lot of eyebrows given their age gap but now they seem to have the support of Scott's ex Kourtney. Earlier in May, a source shared, "It helps that Kourtney now trusts Sofia. The kids are allowed to spend time with her. Sofia likes having them and helps Scott. So far, the kids are giving Kourtney good reports about Sofia."
"Sofia has shown over and over again that she is willing to stay with Scott even when things are not great — but Scott is doing well lately," the source added.