Ben Affleck and Jennifer Garner Reunite to Celebrate Daughter Seraphina's Birthday Together

"It was a small celebration," a source tells PEOPLE

It was a family affair for the Affleck-Garner brood this weekend.

Ben Affleck and Jennifer Garner came together to celebrate daughter Seraphina’s 9th birthday party on Saturday at their L.A. home, a source tells PEOPLE.

“It was a small celebration,” says the source. “Ben was there too. Seraphina had friends over for cake. She got a lot of gifts.”

Despite their split, the stars have remained amicable and continue to co-parent their kids, Violet, 12, Seraphina, 9, and Samuel, 5. Affleck and Garner, both 45, separated in 2015 and filed for divorce this April.

In addition to spending Christmas Day together as a family, the pair were spotted taking a morning stroll together in Los Angeles in December and got together for Thanksgiving as well. The Argo star capped off that holiday by taking his daughters to see the hit musical Hamilton.

Alberto E. Rodriguez/WireImage

Affleck has been continuing his treatment for alcohol addiction. He “is doing well,” a source tells PEOPLE.

“He has been very on top of his health and responsible,” adds the source. “He wants to be sober and healthy.”

Along with spending time with his family, Affleck is also still going strong with girlfriend Lindsay Shookus. The two were spotted on an afternoon shopping trip on Friday.

“They seem great,” says the source. “You can tell they very much enjoy spending time together. They are very affectionate and giddy.”

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