Three times the cuteness!

Scott Disickspent Father’s Day with his trio of mini-mes on Sunday.

The reality star celebrated the special day with the three kids he shares with exKourtney Kardashian: sons Mason, 8, Reign, 3, and daughter Penelope, 5.

Disick and girlfriendSofia Richiegrabbed lunch with the children at Nobu and Malibu, a source tells PEOPLE.

“He seemed happy to spend Father’s Day with his kids and Sofia,” the source says, adding that despite a short split earlier this month, “Sofia again lives with him. Everything seems good now. It’s back to normal.”

He shared photos of his little ones on Instagram, showing off his gifts (a “BEST DAD EVER” placard, a photo of Penelope and a Tom Ford present). In one pic, Reign eats snacks in is pajamas as Penelope naps with a dog.

Scott Disick/Instagram

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Disick, 35, and Kardashian, 39,dated on and off for nine yearsbefore splitting for good in 2015.

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RELATED VIDEO:Kourtney Kardashian‘Trusts’ Sofia Richie with Her andScott Disick’s Kids: Source

Now, Disick is dating 19-year-old Richie (despite abrief breakupearlier this month), while Kardashian is seeingYounes Bendjima.

Richie and Disick have beenofficially datingsince last September after initiallysparking romance rumorsa year ago. In recent months, the relationship appears to have gottenincreasingly serious, with Richie spending plenty of time — and evenvacationing— with his kids.

“It helps that Kourtney now trusts Sofia,” a sourcetold PEOPLEin May. “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.”

source: people.com