The amicable exes were spotted getting brunch together with their daughters Seraphina, 7, and Violet, 10, in Los Angeles. They were seen picking up food from the Amandine Patisserie Café.
"Ben and Jen spent Sunday with their kids. They had brunch together, Jen then ran errands alone and also attended a charity event," a source tells PEOPLE.
The two were all smiles as they chatted and walked through the parking lot after brunch before parting ways in their respective cars.
"Ben and Jen seemed totally fine. They actually acted like they enjoyed hanging out," adds the source. "They were smiling and very friendly. Things definitely seem much better. They also hung out at home over the weekend. The vibe is much happier."
The afternoon outing comes just one week after the former couple were seen having a "nice moment" together at the Vanity Fair Oscar party. There, the two shared a friendly hug and kiss as they mingled among fellow partygoers.
RELATED: Inside Ben Affleck and Jennifer Garner's Split
"They had a nice moment where they caught up and a lot of their friends were there – and they chatted and then they left," a source told PEOPLE.
Affleck and Garner also reunited to celebrate their son Sam's 4th birthday last week with a superhero-themed bash, where Affleck dressed up at Batman.