Ben Affleck and Jennifer Lopez definitely aren't hiding their newly rekindled romance! As a source has shared with People, the couple was spotted out for dinner on Sunday, joining Lopez's family for a special occasion!

Affleck and Lopez said to be "very affectionate" at restaurant

Affleck and Lopez rekindled their romance this year after breaking things off in 2004, and have frequently been seen displaying PDA over the past month. The insider shared that the two were at sushi restaurant Nobu for "a small birthday celebration" for Lopez's sister Lynda, and the group had "enjoyed a Sunday family dinner together."

The source also revealed to People that Affleck and Lopez "sat next to each other and were very affectionate" during the recent restaurant outing. While the back-on-again couple was captured sharing a kiss, they reportedly "held hands under the table" during dinner as well!

Ben Affleck and Jennifer Lopez attend the 75th Annual Academy Awards on March 23, 2003.

Affleck "seemed comfortable" around Lopez's kids, source says

Lopez and Affleck were not only joined by the "Jenny From The Block" singer's sister, but two more family members who are incredibly important to her— her children! Max and Emme— whose father is Lopez's ex, Marc Anthony— were also at Nobu to enjoy the celebratory meal.

"Ben and her kids seemed comfortable together," the source said of Affleck's interactions with the twins. The actor is said to have been "smiling and laughing" during the meal, and the group "ordered a lot of food to share."

As People mentions, Affleck also spent time with his own children over the weekend, celebrating another special occasion! His 12-year-old daughter Seraphina— who he shares with Jennifer Garner— graduated from school, so Affleck was there to be a proud dad!