For the first time that we've seen, since Ben Affleck went public with his new girlfriend Lindsay Shookus, the actor reunited with estranged wife Jennifer Garner and his kids Sunday night for dinner in Brentwood and we've got the EXCLUSIVE pix!

Ben looked a little tired and a little uninvolved as Jen and the couple's three children Violet, Seraphina and Samuel met up for dinner at new pizza hotspot Pizzana, owned by Jen's pal, NCIS star Chris O'Donnell.

And while family dinners and co-parenting are certainly a good thing, our photographer on the scene says it wasn't perfect: "Ben was checking his phone and had a smug look on his face. You couldn't tell if he was annoyed at having to do family dinner or if he was uncomfortable with his kids after having officially jumped ship on the family."

As the fivesome waited for the car at the valet, Ben looked unengaged and even annoyed. Bookworm Violet -- who brought her favorite read to dinner -- had something important to tell her parents about the book's plotline and Ben looked ... uninterested. Little Samuel appeared to vie for his dad's attention and jumped into his arms at one point. It's gotta make Ben melt, right?! But we never saw Ben crack a smile :(