Affleck and de Armas have been romantically linked since early March when they were seen on a trip to her native Cuba. The couple previously met for the first time while filming their thriller in New Orleans.
De Armas later confirmed their relationship on Instagram in April when she shared photos of them spending time together for her 32nd birthday.
A friend of Affleck previously told PEOPLE earlier this year that he and de Armas are "enjoying their time together."
"He makes her laugh and she’s a great influence," the friend added. "They safely visit with his family and he works to make sure he is healthy and present for his family. His priority will always be his children and making that work."
Affleck previously introduced de Armas to his three children — daughters Violet, 14, and Seraphina, 11; and son Samuel, 8 — earlier this year.
In June, the kids, alongside de Armas, played a prank on Affleck by leaving a cardboard cutout of the actress on his lawn. The cutout featured the Blade Runner 2049 star striking a pose while lying on her stomach and smiling widely.
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